don't build docs on forks

Author: rlindner81

.github/workflows/build-and-deploy-docs.yml

@@ -23,6 +23,7 @@ concurrency:
 jobs:
   build:
     runs-on: ubuntu-latest
+    if: github.repository_owner == 'cap-js-community'  # don't build on forks
     defaults:
       run:
         working-directory: docs