docker: upgrade base images to alpine3.14 (#6675)

.github/workflows/docker.yml

@@ -13,10 +13,16 @@ jobs:
   buildx:
     runs-on: ubuntu-latest
     steps:
+      - name: Canel previous runs on main
+        if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+        uses: styfle/cancel-workflow-action@0.9.1
+        with:
+          all_but_latest: true
+          access_token: ${{ secrets.GITHUB_TOKEN }}
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Set up QEMU
-        id: qemu
+        if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
         uses: docker/setup-qemu-action@v1
       - name: Set up Docker Buildx
         id: buildx
@@ -32,14 +38,7 @@ jobs:
           echo "Status:    ${{ steps.buildx.outputs.status }}"
           echo "Flags:     ${{ steps.buildx.outputs.flags }}"
           echo "Platforms: ${{ steps.buildx.outputs.platforms }}"
-      - name: Build images on pull requests
-        if: ${{ github.event_name == 'pull_request' }}
-        uses: docker/build-push-action@v2
-        with:
-          context: .
-          platforms: linux/amd64,linux/arm64,linux/arm/v7
       - name: Login to Docker Hub
-        if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
         uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
@@ -51,7 +50,18 @@ jobs:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Build and push images on commits to main
+      - name: Get short commit SHA
+        uses: benjlevesque/short-sha@v1.2
+      - name: Build and push images on pull requests
+        if: ${{ github.event_name == 'pull_request' }}
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64
+          push: true
+          tags: |
+            gogs/gogs:commit-${{ env.SHA }}
+      - name: Build and push images on main
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
         uses: docker/build-push-action@v2
         with: