No need to run pre-merge on all the OS

Author: cortinico

.github/workflows/pre-merge.yaml

@@ -10,10 +10,7 @@ on:
 
 jobs:
   gradle:
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     if: ${{ !contains(github.event.head_commit.message, 'ci skip') }}
     steps:
       - name: Checkout Repo