diff --git a/.gitea/workflows/publish.yaml b/.gitea/workflows/publish.yaml
index 3e41770..82e3ee5 100644
--- a/.gitea/workflows/publish.yaml
+++ b/.gitea/workflows/publish.yaml
@@ -75,6 +75,7 @@ jobs:
           HARBOR_PASSWORD: ${{ secrets.HARBOR_PASSWORD }}
         run: |
           set -euo pipefail
+          test -n "$HARBOR_USERNAME" && test -n "$HARBOR_PASSWORD"
           printf '%s' "$HARBOR_PASSWORD" | docker login harbor.k3s.k0.nu --username "$HARBOR_USERNAME" --password-stdin
           unset HARBOR_PASSWORD
           version="$(cat VERSION)"
@@ -110,6 +111,7 @@ jobs:
         run: |
           set -euo pipefail
           version="$(cat VERSION)"
+          test -n "$HARBOR_USERNAME" && test -n "$HARBOR_PASSWORD"
           if [[ "$GITHUB_REF" == refs/tags/* ]]; then test "$GITHUB_REF_NAME" = "v$version"; else test "$AUTO_RELEASE_VERSION" = "$version"; fi
           python3 scripts/bump-version.py --check
           printf '%s' "$HARBOR_PASSWORD" | docker login harbor.k3s.k0.nu --username "$HARBOR_USERNAME" --password-stdin