Fix Aarch64 CI workflow

Author: nazar-pc

.github/workflows/snapshot-build.yml

@@ -68,7 +68,7 @@ jobs:
         id: build
         uses: docker/build-push-action@v2
         with:
-          file: Dockerfile-${{ matrix.image }}${{ matrix.dockerfile-suffix }}
+          file: Dockerfile-${{ matrix.image }}${{ matrix.platform.dockerfile-suffix }}
           platforms: ${{ matrix.platform.arch }}
           # Only push for releases
           push: ${{ github.event_name == 'push' && github.ref_type == 'tag' }}