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

@@ -53,18 +53,20 @@ jobs:
             REMAIN=$((COUNT - 10))
             echo "$TAGS" | head -n $REMAIN > /tmp/old_tags
           else
-            echo "less than 10 tags, skipping cleanup"
+            echo less than 10 tags, skipping cleanup
             echo "" > /tmp/old_tags
           fi
 
       - name: Remove tags
         run: |
           cat /tmp/old_tags | while read TAG; do
-            DIGEST=$(curl -u "${{ secrets.REGISTRY_USER }}:${{ secrets.REGISTRY_PASS }}" -sS -H 'Accept: application/vnd.docker.distribution.manifest.v2+json' -o /dev/null -w '%header{Docker-Content-Digest}' https://${{ secrets.REGISTRY_PATH }}/v2/umbrella/manifests/$TAG)
-            if [ -n "$DIGEST" ]; then
-              echo about to delete $TAG
-              curl -u "${{ secrets.REGISTRY_USER }}:${{ secrets.REGISTRY_PASS }}" -sS -X DELETE https://${{ secrets.REGISTRY_PATH }}/v2/umbrella/manifests/$DIGEST
-            else
-              echo failed to get digest for $TAG
+            if [ -n "$TAG" ]; then
+              DIGEST=$(curl -u "${{ secrets.REGISTRY_USER }}:${{ secrets.REGISTRY_PASS }}" -sS -H 'Accept: application/vnd.docker.distribution.manifest.v2+json' -o /dev/null -w '%header{Docker-Content-Digest}' https://${{ secrets.REGISTRY_PATH }}/v2/umbrella/manifests/$TAG)
+              if [ -n "$DIGEST" ]; then
+                echo about to delete $TAG
+                curl -u "${{ secrets.REGISTRY_USER }}:${{ secrets.REGISTRY_PASS }}" -sS -X DELETE https://${{ secrets.REGISTRY_PATH }}/v2/umbrella/manifests/$DIGEST
+              else
+                echo failed to get digest for $TAG
+              fi
             fi
           done