chore: added github workflow for plane-proxy

.github/workflows/push-image-proxy.yml

@@ -0,0 +1,56 @@
+name: Build and Push Proxy Docker Image
+
+on:
+  pull_request:
+    types: [closed]
+    branches: [develop]
+  release:
+    types: [released]
+
+jobs:
+  build_push_proxy:
+    name: Build and Push Proxy Docker Image
+    runs-on: ubuntu-20.04
+
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v3.3.0
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2.5.0
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2.1.0
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker (Docker Hub) from Github Pull Request
+        id: meta_pr
+        if: ${{ github.event_name == 'pull_request' }}
+        uses: docker/metadata-action@v4.3.0
+        with:
+          images: ${{ secrets.DOCKERHUB_USERNAME }}/plane-proxy
+          tags: type=raw,value=develop
+
+      - name: Extract metadata (tags, labels) for Docker (Docker Hub) from Github Release
+        id: meta
+        uses: docker/metadata-action@v4.3.0
+        if: ${{ github.event_name == 'release' }}
+        with:
+          images: ${{ secrets.DOCKERHUB_USERNAME }}/plane-proxy
+          tags: |
+            type=ref,event=tag
+
+      - name: Build and Push to Docker Hub
+        uses: docker/build-push-action@v4.0.0
+        with:
+          context: ./nginx
+          file: ./nginx/Dockerfile
+          platforms: linux/amd64
+          push: true
+          tags: ${{ github.event_name == 'release' && steps.meta.outputs.tags || steps.meta_pr.outputs.tags }}
+        env:
+          DOCKER_BUILDKIT: 1
+          DOCKER_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+          DOCKET_PASSWORD: ${{ secrets.DOCKERHUB_TOKEN }}