docker: pass in build-args, add $NOW

.github/workflows/docker.yml

@@ -20,6 +20,11 @@ jobs:
       -
         name: Checkout
         uses: actions/checkout@v3
+      -
+        name: Set environment variables
+        run: |
+          echo "BRANCH=${GITHUB_REF#refs/heads/}" >> $GITHUB_ENV
+          echo "NOW=$(date +'%Y-%m-%dT%H:%M:%S')" >> $GITHUB_ENV
       -
         name: Set up QEMU
         uses: docker/setup-qemu-action@v2
@@ -29,6 +34,7 @@ jobs:
       -
         name: Login to Docker Hub
         uses: docker/login-action@v2
+        if: ${{ secrets.DOCKERHUB_USERNAME && secrets.DOCKERHUB_TOKEN }}
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
@@ -44,8 +50,12 @@ jobs:
         uses: docker/build-push-action@v4
         with:
           context: .
-          platforms: linux/amd64,linux/arm64 # ,linux/arm/v7
           push: true
+          build-args: |
+            COMMIT=${{ github.sha }}
+            BRANCH=${{ env.BRANCH }}
+            NOW=${{ env.NOW }}
+          platforms: linux/amd64,linux/arm64 # ,linux/arm/v7
           tags: |
             voglerr/free-games-claimer:latest
             ghcr.io/vogler/free-games-claimer:latest