Always build for all the platforms

Author: ferrarimarco

.github/workflows/main.yml

@@ -1,5 +1,6 @@
 env:
   CONTAINER_IMAGE_TAG: githubchangeloggenerator/github-changelog-generator:latest
+  DOCKER_BUILDX_PLATFORMS: linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x
 
 name: Build and deploy latest image
 
@@ -22,12 +23,12 @@ jobs:
         uses: docker/setup-buildx-action@v1
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
-      - name: Build the container image for x86_64 to get early feedback
+      - name: Build the container image
         uses: docker/build-push-action@v2
         with:
           context: .
           file: ./Dockerfile
-          platforms: linux/amd64
+          platforms: ${{ env.DOCKER_BUILDX_PLATFORMS }}
           push: false
           tags: ${{ env.CONTAINER_IMAGE_TAG }}
   deploy:
@@ -52,7 +53,7 @@ jobs:
         with:
           context: .
           file: ./Dockerfile
-          platforms: linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x
+          platforms: ${{ env.DOCKER_BUILDX_PLATFORMS }}
           push: true
           tags: ${{ env.CONTAINER_IMAGE_TAG }}
       - name: Test the container image