fixed syntax

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

.gitea/workflows/docker.yaml

@@ -26,7 +26,7 @@ jobs:
           password: ${{ secrets.REGISTRY_PASS }}
 
       - name: Re-tag the most recent image
-      - run: |
+        run: |
           REGISTRY="${{ secrets.REGISTRY_PATH }}"
           REPO="umbrella"
           USER="${{ secrets.DOCKER_USERNAME }}"