ci: propagate docker/metadata-action labels to published images (#7484)

Author: tete17

.github/workflows/osrm-backend-docker.yml

@@ -81,6 +81,7 @@ jobs:
           platforms: linux/amd64,linux/arm64
           file: ./docker/Dockerfile-${{ matrix.docker-base-image }}
           tags: ${{ steps.metadebug.outputs.tags  }}
+          labels: ${{ steps.metadebug.outputs.labels }}
           build-args: |
             DOCKER_TAG=${{ join(steps.metadebug.outputs.tags ) }}-${{ matrix.docker-base-image }}
 
@@ -92,6 +93,7 @@ jobs:
           platforms: linux/amd64,linux/arm64
           file: ./docker/Dockerfile-${{ matrix.docker-base-image }}
           tags: ${{ steps.metaassertions.outputs.tags  }}
+          labels: ${{ steps.metaassertions.outputs.labels }}
           build-args: |
             DOCKER_TAG=${{ join(steps.metaassertions.outputs.tags ) }}-${{ matrix.docker-base-image }}
 
@@ -103,5 +105,6 @@ jobs:
           platforms: linux/amd64,linux/arm64
           file: ./docker/Dockerfile-${{ matrix.docker-base-image }}
           tags: ${{ steps.meta.outputs.tags  }}
+          labels: ${{ steps.meta.outputs.labels }}
           build-args: |
             DOCKER_TAG=${{ join(steps.meta.outputs.tags ) }}-${{ matrix.docker-base-image }}