trying to prevent deletion of all tags if less than 10 are present

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

.gitea/workflows/docker.yaml

@@ -49,8 +49,13 @@ jobs:
         run: |
           TAGS="$(curl -s -u "${{ secrets.REGISTRY_USER }}:${{ secrets.REGISTRY_PASS }}" https://${{ secrets.REGISTRY_PATH }}/v2/umbrella/tags/list | jq -r ".tags[]")"
           COUNT=$(echo "$TAGS" | wc -l)
+          if [ $COUNT -gt 10 ]; then
             REMAIN=$((COUNT - 10))
             echo "$TAGS" | head -n $REMAIN > /tmp/old_tags
+          else
+            echo "less than 10 tags, skipping cleanup
+            echo "" > /tmp/old_tags
+          fi
 
       - name: Remove tags
         run: |