Publish artifacts only for main

Author: danslapman

.github/workflows/ci.yml

@@ -28,6 +28,7 @@ jobs:
         run: sbt test
 
       - name: Publish artifacts
+        if: github.ref == 'refs/heads/main'
         env:
           PGP_PASSPHRASE: ${{ secrets.PGP_PASSPHRASE }}
           PGP_SECRET: ${{ secrets.PGP_SECRET }}