ci: Add debug logging to nightly build

For some reason the secret gate doesn't work and the main Gitblit
repo also attempts to deploy the nightly to Docker which must fail.

.github/workflows/nightly-build.yml

@@ -111,6 +111,8 @@ jobs:
         run: |
           if [[ -n "${{secrets.DOCKERHUB_GB_TOKEN}}" && -n "${{secrets.DOCKERHUB_GB_USER}}" ]] ; then
             echo "::set-output name=secrets_present::true"
+          else
+            echo "No Docker Hub login data found. Skipping Docker."
           fi
 
 
@@ -121,7 +123,7 @@ jobs:
   docker:
     name: Build and push nightly docker image
     runs-on: ubuntu-latest
-    if: ${{needs.secret-gate.outputs.build_docker == 'true'}} && (github.ref == 'refs/heads/master' || github.ref == 'refs/heads/develop')
+    if: needs.secret-gate.outputs.build_docker == 'true' && (github.ref == 'refs/heads/master' || github.ref == 'refs/heads/develop')
     needs: secret-gate
     env:
       GH_ORG: gitblit