Ensure zip utility is installed in runner

.gitea/workflows/build.yaml

@@ -16,6 +16,7 @@ jobs:
 
       - name: Package Extension
         run: |
+          which zip >/dev/null 2>&1 || (apt-get update && apt-get install -y zip)
           mkdir -p dist
           zip -r dist/gq-to-org-redirector.zip manifest.json rules.json README.md