Update docker.yml

Signed-off-by: Jan Kowalleck <jan.kowalleck@gmail.com>

Author: jkowalleck

.github/workflows/docker.yml

@@ -68,7 +68,8 @@ jobs:
           VERSION: ${{ steps.bump-version.outputs.version }}
         run: >
           docker build -f Dockerfile
-          --label 'org.opencontainers.image.source=${{ github.server_url }}/${{ github.repository }}'
+          --label "org.opencontainers.image.source=${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}"
+          --label "org.opencontainers.image.revision=${GITHUB_SHA}"
           --build-arg "VERSION=$VERSION"
           -t "$DOCKER_TAG"
           .