trying to re-tag image

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

.gitea/workflows/docker.yaml

@@ -16,7 +16,7 @@ jobs:
       - name: Build docker image
         run: |
           docker build -t umbrella .
-          docker tag umbrella ${{ secrets.REGISTRY_PATH }}/umbrella:latest
+          docker tag umbrella ${{ secrets.REGISTRY_PATH }}/umbrella:${{ gitea.ref_name }}
 
       - name: Login to registry
         uses: docker/login-action@v2
@@ -25,7 +25,28 @@ jobs:
           username: ${{ secrets.REGISTRY_USER }}
           password: ${{ secrets.REGISTRY_PASS }}
 
+      - name: Re-tag the most recent image
+      - run: |
+          REGISTRY="${{ secrets.REGISTRY_PATH }}"
+          REPO="umbrella"
+          USER="${{ secrets.DOCKER_USERNAME }}"
+          PASS="${{ secrets.DOCKER_PASSWORD }}"
+          LATEST="${{ gitea.ref_name }}"
+          NEW_TAG="${{ gitea.sha_short }}"
+          
+          # Get auth token (basic auth for most self-hosted registries)
+          TOKEN=$(curl -s -u "$USER:$PASS" "https://$REGISTRY/v2/token?service=$REGISTRY&scope=repository:$REPO:pull,push")
+          AUTH="Bearer $(echo $TOKEN | jq -r .token)"
+          
+          # Fetch latest manifest (specify mediaType header for OCI support)
+          MANIFEST=$(curl -s -H "Authorization: $AUTH" -H "Accept: application/vnd.docker.distribution.manifest.v2+json,application/vnd.oci.image.manifest.v1+json" "https://$REGISTRY/v2/$REPO/manifests/$LATEST" | jq -c .)
+          
+          # PUT manifest under new tag
+          curl -X PUT -s -H "Authorization: $AUTH" -H "Content-Type: application/vnd.docker.distribution.manifest.v2+json" --data "$MANIFEST" "https://$REGISTRY/v2/$REPO/manifests/$NEW_TAG"
+          
+          echo "Tagged $REGISTRY/$REPO:$LATEST -> $NEW_TAG"
+
       - name: Push to registry
 #        if: startsWith(gitea.ref, 'refs/tags/')
         run: |
-          docker push ${{ secrets.REGISTRY_PATH }}/umbrella:latest
+          docker push ${{ secrets.REGISTRY_PATH }}/umbrella:${{ gitea.ref_name }}