Add docker/setup-buildx-action to build_docker job

Author: manastyretskyi

.github/workflows/on_release_publish.yml

@@ -161,42 +161,68 @@ jobs:
     env:
       DOCKERHUB_ORG: gospatial
       DOCKERHUB_REPO: tegola
+      BUILD_ARGS: |
+        BUILDPKG=${BUILD_PKG}
+        VER=${VERSION}
+        BRANCH=${GIT_BRANCH}
+        REVISION=${GIT_REVISION}
 
     steps:
     - name: Check out code
       uses: actions/checkout@v3
 
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v2
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+
+    - name: Login to Docker Hub
+      uses: docker/login-action@v2
+      with:
+        username: ${{ secrets.DOCKERHUB_USER }}
+        password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
     - name: Setup env
       uses: ./.github/actions/tegola-setup-env
       with:
         ui: true
 
-    - name: Build and tag Docker container
+    # Buildx can only output single-platform result image to docker
+    # so for testing purposes we are building only for linux/amd64
+    # Later when we publish the image we build for linux/amd64 and linux/arm64
+    # Note that linux/amd64 is cached, so when we build images for publishing
+    # we are not rebuilding linux/amd64
+    - name: Build docker image for testing
+      uses: docker/build-push-action@v4
+      with:
+        context: .
+        load: true
+        platforms: linux/amd64
+        build-args: ${{ env.BUILD_ARGS }}
+        tags: ${{ env.DOCKERHUB_ORG }}/${{ env.DOCKERHUB_REPO }}:${{ env.VERSION }}
+
+    - name: Test image build
       run: |
-        docker build -t tegola --build-arg BUILDPKG=${BUILD_PKG} --build-arg VER=${VERSION} --build-arg BRANCH=${GIT_BRANCH} --build-arg REVISION=${GIT_REVISION} .
-        docker tag tegola:latest ${DOCKERHUB_ORG}/${DOCKERHUB_REPO}:${VERSION}
-        docker tag tegola:latest ${DOCKERHUB_ORG}/${DOCKERHUB_REPO}:latest
-        docker tag tegola:latest ${DOCKERHUB_ORG}/${DOCKERHUB_REPO}:edge
-        docker run --rm tegola version
+        docker run --rm ${DOCKERHUB_ORG}/${DOCKERHUB_REPO}:${VERSION} version
 
     - name: Publish Docker edge container
       if: github.ref == env.DEFAULT_BRANCH_REF
-      env:
-          DOCKERHUB_USER: ${{ secrets.DOCKERHUB_USER }}
-          DOCKERHUB_PASSWORD: ${{ secrets.DOCKERHUB_PASSWORD }}
-      run: |
-        echo ${DOCKERHUB_PASSWORD} | docker login -u ${DOCKERHUB_USER} --password-stdin
-        docker push ${DOCKERHUB_ORG}/${DOCKERHUB_REPO}:edge
+      uses: docker/build-push-action@v4
+      with:
+        push: true
+        tags: ${{ env.DOCKERHUB_ORG }}/${{ env.DOCKERHUB_REPO }}:edge
+        platforms: linux/amd64,linux/arm64
+        build-args: ${{ env.BUILD_ARGS }}
 
     - name: Publish Docker container
       if: github.event_name == 'release'
-      env:
-          DOCKERHUB_USER: ${{ secrets.DOCKERHUB_USER }}
-          DOCKERHUB_PASSWORD: ${{ secrets.DOCKERHUB_PASSWORD }}
-      run: |
-        echo ${DOCKERHUB_PASSWORD} | docker login -u ${DOCKERHUB_USER} --password-stdin
-        docker push ${DOCKERHUB_ORG}/${DOCKERHUB_REPO}:${VERSION}
-        docker push ${DOCKERHUB_ORG}/${DOCKERHUB_REPO}:latest
+      uses: docker/build-push-action@v4
+      with:
+        push: true
+        tags: ${{ env.DOCKERHUB_ORG }}/${{ env.DOCKERHUB_REPO }}:${{ env.VERSION }},${{ env.DOCKERHUB_ORG }}/${{ env.DOCKERHUB_REPO }}:latest
+        platforms: linux/amd64,linux/arm64
+        build-args: ${{ env.BUILD_ARGS }}
 
   build_windows:
     name: Build for Windows