Fix failing CI of pull requests

adds a guard to prevent pull requests from trying to delete the previous pre-release

closing https://github.com/official-stockfish/Stockfish/pull/4631

No functional change.

diff --git a/.github/workflows/stockfish.yml b/.github/workflows/stockfish.yml
index ca52ffe08b36317085d86ff4df50e240d59c54bd..99c4259ac756f0d816c65aaaee3252f644fa3bef 100644 (file)
--- a/.github/workflows/stockfish.yml
+++ b/.github/workflows/stockfish.yml
@@ -13,6 +13,7 @@ on:
       - tools
 jobs:
   Prerelease:
+    if: github.ref == 'refs/heads/master'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3