fix github build action

Author: danielraab

.github/workflows/docker-build.yml

@@ -45,6 +45,7 @@ jobs:
             type=raw,value=latest,enable={{is_default_branch}}
 
       - name: Build and push Docker image
+        id: build
         uses: docker/build-push-action@v5
         with:
           context: .
@@ -60,5 +61,5 @@ jobs:
         uses: actions/attest-build-provenance@v1
         with:
           subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          subject-digest: ${{ steps.meta.outputs.digest }}
+          subject-digest: ${{ steps.build.outputs.digest }}
           push-to-registry: true