build on different operating systems

Author: imanushin

.github/workflows/pre-merge.yaml

@@ -18,7 +18,8 @@ jobs:
       fail-fast: false
       matrix:
         # build project on some operating systems
-        os: [ ubuntu-latest ]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        # build on different java versions
         jdk: [ 11, 17, 21 ]
     runs-on: ${{ matrix.os }}
     steps: