Merge pull request #503 from audreyt/main

 * stop running releases on forks to avoid spurious errors

.github/workflows/main.yml

@@ -7,6 +7,7 @@ on:
 
 jobs:
   build:
+    if: github.repository_owner == 'pluralitybook'
     runs-on: ubuntu-latest
     permissions:
       contents: write