Add CI workflow for building and releasing server docker images

.github/actions/bootstrap/action.yml

@@ -4,7 +4,7 @@ inputs:
   python-version:
     description: "Version range or exact version of Python or PyPy to use, using SemVer's version range syntax."
     default: 3.8
-  pip-version: 
+  pip-version:
     description: "Version of pip to be installed using pip"
     default: 23.3.1
   setuptools-version:
@@ -13,6 +13,19 @@ inputs:
   poetry-version:
     description: "Version of poetry to be installed using pip"
     default: 1.5.1
+outputs:
+  python-version:
+    description: "Version range or exact version of Python or PyPy"
+    value: ${{ steps.versions.outputs.python-version }}
+  pip-version:
+    description: "Installed version of pip"
+    value: ${{ steps.versions.outputs.pip-version }}
+  setuptools-version:
+    description: "Installed version of setuptools"
+    value: ${{ steps.versions.outputs.setuptools-version }}
+  poetry-version:
+    description: "Installed version of poetry"
+    value: ${{ steps.versions.outputs.poetry-version }}
 runs:
   using: "composite"
   steps:
@@ -27,3 +40,10 @@ runs:
         python -m pip install -U poetry==${{ inputs.poetry-version }}
         python -m poetry config virtualenvs.create false
       shell: bash
+    - id: versions
+      shell: bash
+      run: |
+        echo "python-version=$(echo ${{ inputs.python-version }})" >> $GITHUB_OUTPUT
+        echo "pip-version=$(echo ${{ inputs.pip-version }})" >> $GITHUB_OUTPUT
+        echo "setuptools-version=$(echo ${{ inputs.setuptools-version }})" >> $GITHUB_OUTPUT
+        echo "poetry-version=$(echo ${{ inputs.poetry-version }})" >> $GITHUB_OUTPUT

.github/workflows/_docker-server.yml

@@ -0,0 +1,193 @@
+name: Reusable docker server image build workflow
+
+on:
+  workflow_call:
+    inputs:
+      flwr-version:
+        description: "Version of Flower."
+        required: true
+        type: string
+      python-version:
+        description: "Version of Python e.g. (3.11.7 or 3.11). Defaults to 3.11."
+        required: false
+        type: string
+      pip-version:
+        description: "Version of pip. Defaults to the version defined in actions/bootstrap."
+        required: false
+        type: string
+      setuptools-version:
+        description: "Version of setuptools. Defaults to the version defined in actions/bootstrap."
+        required: false
+        type: string
+      ubuntu-version:
+        description: "Version of Ubuntu. Defaults to 22.04."
+        required: false
+        type: string
+    secrets:
+      dockerhub-user:
+        required: true
+      dockerhub-token:
+        required: true
+    outputs:
+      metadata:
+        description: "Metadata of the docker image."
+        value: ${{ jobs.build-manifest.outputs.metadata }}
+
+env:
+  REGISTRY_IMAGE: flwr/server
+  DEFAULT_PYTHON: 3.11
+  DEFAULT_UBUNTU: 22.04
+
+permissions:
+  contents: read
+
+# based on https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners
+jobs:
+  parameters:
+    name: Collect build parameters
+    runs-on: ubuntu-22.04
+    timeout-minutes: 10
+    outputs:
+      pip-version: ${{ steps.versions.outputs.pip-version }}
+      setuptools-version: ${{ steps.versions.outputs.setuptools-version }}
+      python-version: ${{ steps.versions.outputs.python-version }}
+      ubuntu-version: ${{ steps.versions.outputs.ubuntu-version }}
+
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+
+      - uses: ./.github/actions/bootstrap
+        if: ${{ !(inputs.pip-version != '' && inputs.setuptools-version != '') }}
+        id: bootstrap
+
+      - id: versions
+        run: |
+          if [[ "${{ inputs.pip-version }}" = "" ]]; then
+              echo "pip-version=${{  steps.bootstrap.outputs.pip-version }}" >> "$GITHUB_OUTPUT"
+          else
+              echo "pip-version=${{ inputs.pip-version }}" >> "$GITHUB_OUTPUT"
+          fi
+
+          if [[ "${{ inputs.setuptools-version }}" = "" ]]; then
+              echo "setuptools-version=${{  steps.bootstrap.outputs.setuptools-version }}" >> "$GITHUB_OUTPUT"
+          else
+              echo "setuptools-version=${{ inputs.setuptools-version }}" >> "$GITHUB_OUTPUT"
+          fi
+
+          if [[ "${{ inputs.python-version }}" = "" ]]; then
+              echo "python-version=${{  env.DEFAULT_PYTHON }}" >> "$GITHUB_OUTPUT"
+          else
+              echo "python-version=${{ inputs.python-version }}" >> "$GITHUB_OUTPUT"
+          fi
+
+          if [[ "${{ inputs.ubuntu-version }}" = "" ]]; then
+              echo "ubuntu-version=${{  env.DEFAULT_UBUNTU  }}" >> "$GITHUB_OUTPUT"
+          else
+              echo "ubuntu-version=${{ inputs.ubuntu-version }}" >> "$GITHUB_OUTPUT"
+          fi
+
+  build:
+    name: Build server image
+    runs-on: ubuntu-22.04
+    timeout-minutes: 60
+    needs: parameters
+    strategy:
+      fail-fast: true
+      matrix:
+        platform: [
+            # build-push action and qemu use different platform names
+            # therefore we create a map
+            { qemu: "", docker: "linux/amd64" },
+            { qemu: "arm64", docker: "linux/arm64" },
+          ]
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+
+      - name: Set up QEMU
+        if: matrix.platform.qemu != ''
+        uses: docker/setup-qemu-action@68827325e0b33c7199eb31dd4e31fbe9023e06e3 # v3.0.0
+        with:
+          platforms: ${{ matrix.platform.qemu }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@31cebacef4805868f9ce9a0cb03ee36c32df2ac4 # v5.3.0
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
+        with:
+          username: ${{ secrets.dockerhub-user }}
+          password: ${{ secrets.dockerhub-token }}
+
+      - name: Build and push
+        id: build
+        uses: docker/build-push-action@4a13e500e55cf31b7a5d59a38ab2040ab0f42f56 # v5.1.0
+        with:
+          platforms: ${{ matrix.platform.docker }}
+          context: src/docker/server
+          build-args: |
+            PYTHON_VERSION=${{ needs.parameters.outputs.python-version }}
+            PIP_VERSION=${{ needs.parameters.outputs.pip-version }}
+            SETUPTOOLS_VERSION=${{ needs.parameters.outputs.setuptools-version }}
+            FLWR_VERSION=${{ inputs.flwr-version }}
+            UBUNTU_VERSION=${{ needs.parameters.outputs.ubuntu-version }}
+          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
+
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+
+      - name: Upload digest
+        uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
+        with:
+          name: digests
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  build-manifest:
+    name: Build and push docker manifest for all platforms
+    runs-on: ubuntu-22.04
+    timeout-minutes: 10
+    needs: [parameters, build]
+    outputs:
+      metadata: ${{ steps.meta.outputs.json }}
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@9bc31d5ccc31df68ecc42ccf4149144866c47d8a # v3.0.2
+        with:
+          name: digests
+          path: /tmp/digests
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@31cebacef4805868f9ce9a0cb03ee36c32df2ac4 # v5.3.0
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+          tags: |
+            ${{ inputs.flwr-version }}-py${{ needs.parameters.outputs.python-version }}-ubuntu${{ needs.parameters.outputs.ubuntu-version }}
+            ${{ inputs.flwr-version }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
+        with:
+          username: ${{ secrets.dockerhub-user }}
+          password: ${{ secrets.dockerhub-token }}
+
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+              $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)
+      - name: Inspect image
+        run: docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}

.github/workflows/docker-server.yml

@@ -0,0 +1,52 @@
+name: Build docker server image
+
+on:
+  workflow_dispatch:
+    inputs:
+      flwr-version:
+        description: "Version of Flower e.g. (1.6.0)."
+        required: true
+        type: string
+      python-version:
+        description: "Version of Python e.g. (3.11.7 or 3.11). Defaults to the version defined in _docker-server.yaml."
+        required: false
+        type: string
+      pip-version:
+        description: "Version of pip. Defaults to the version defined in _docker-server.yaml."
+        required: false
+        type: string
+      setuptools-version:
+        description: "Version of setuptools. Defaults to the version defined in _docker-server.yaml."
+        required: false
+        type: string
+      ubuntu-version:
+        description: "Version of Ubuntu. Defaults to the version defined in _docker-server.yaml."
+        required: false
+        type: string
+
+permissions:
+  contents: read
+
+jobs:
+  build-server-images:
+    uses: ./.github/workflows/_docker-server.yml
+    with:
+      flwr-version: ${{ github.event.inputs.flwr-version }}
+      python-version: ${{ github.event.inputs.python-version }}
+      pip-version: ${{ github.event.inputs.pip-version }}
+      setuptools-version: ${{ github.event.inputs.setuptools-version }}
+      ubuntu-version: ${{ github.event.inputs.ubuntu-version }}
+    secrets:
+      dockerhub-user: ${{ secrets.DOCKERHUB_USERNAME }}
+      dockerhub-token: ${{ secrets.DOCKERHUB_TOKEN }}
+
+  summary:
+    runs-on: ubuntu-22.04
+    needs: build-server-images
+    steps:
+      - run: |
+          echo "### Images" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          for IMAGE in $(echo ${{ toJson(needs.build-server-images.outputs.metadata) }} | jq -r '.tags[]' ); do
+            echo "- $IMAGE" >> $GITHUB_STEP_SUMMARY
+          done