ci: move Dockerfile.unify to Dockerfile

Signed-off-by: Paul Spooren <mail@aparcar.org>

.github/workflows/containers.yml

@@ -194,7 +194,6 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v3
         with:
-          file: Dockerfile.unify
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
@@ -264,7 +263,6 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v3
         with:
-          file: Dockerfile.unify
           push: ${{ github.event_name != 'pull_request' }}
           tags: |
             ${{ steps.meta_ref.outputs.tags }}
@@ -325,7 +323,6 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v3
         with:
-          file: Dockerfile.unify
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           build-args: |