use github.repository for condition

Author: wilgert

.github/workflows/main.yml

@@ -4,7 +4,7 @@ on: [pull_request]
 
 jobs:
   check:
-    # if: contains(github.base_ref,'HackYourFuture')
+    if: contains(github.repository,'HackYourFuture')
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2