Create CI workflow with build-product job

.github/workflows/ci.yml

@@ -0,0 +1,79 @@
+name: CI
+on:
+  push:
+    branches: [master]
+
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build-product:
+    runs-on: macos-latest  # The fastest runner
+    steps:
+      - uses: actions/checkout@v3.5.3
+
+      # TODO: generate versions from Common.java
+      - uses: actions/setup-python@v4.6.1
+        with:
+          python-version: |
+            3.8
+            3.9
+            3.10
+            3.11
+
+      - name: Install Python requirements
+        run: pip install -r product/runtime/requirements-build.txt
+
+      # TODO: move versions to a single location used by both CI and
+      # runtime/build.gradle.
+      - name: Set up Android SDK
+        run: "$ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager
+          'cmake;3.22.1' 'ndk;22.1.7171670' 'platforms;android-30'"
+
+      - name: Unpackage target
+        run: |
+          target_dir=$(pwd)/maven/com/chaquo/python/target
+          mkdir -p $target_dir
+          cd $target_dir
+
+          # TODO: generate versions from Common.java
+          for version in 3.8.16-0 3.9.13-1 3.10.6-1 3.11.0-2; do
+              mkdir $target_dir/$version
+              cd $target_dir/$version
+              target_url=https://repo.maven.apache.org/maven2/com/chaquo/python/target
+              wget -r -l1 -nd -A .zip -e robots=off -U Mozilla/5.0 $base_url/$version
+
+              cd $GITHUB_WORKSPACE/target
+              ./unpackage-target.sh ./prefix $target_dir/$version
+          done
+
+      - name: Create local.properties
+        run: |
+          for version in 8 11; do
+              java_home=${!JAVA_HOME_${version}_X64}
+              echo chaquopy.java.home.$version=$java_home >> product/local.properties
+          done
+
+      - name: Build
+        run: |
+          cd product
+          ./gradlew publish
+
+      - uses: actions/upload-artifact@v3.1.2
+        with:
+          name: maven
+          path: maven
+          if-no-files-found: error
+
+  # test-gradle-plugin:
+  #   needs: build-product
+  #   strategy:
+  #     fail-fast: false
+  #     matrix:
+  #       os: [macos, ubuntu, windows]
+  #       agp-version: ["8.0"]  # TODO: generate from directory listing
+
+  #   runs-on: ${{ matrix.os }}-latest
+  #   steps:
+  #     - FIXME

target/.gitignore

@@ -1,2 +1 @@
-/prefix
 */build

target/prefix/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore