add lib/ to release artifacts, release job should only run on master

.github/workflows/main.yml

@@ -230,6 +230,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     needs: [build-msvc, build-linux, build-mac]
+    if: github.ref == 'refs/heads/master'
 
     steps:
       - uses: actions/checkout@v3
@@ -256,6 +257,9 @@ jobs:
             })
 
       - uses: actions/download-artifact@v3
+      - run: cp -r lib/ windows
+      - run: cp -r lib/ linux
+      - run: cp -r lib/ macos
       - run: zip -r windows.zip windows
       - run: tar czf linux.tar.gz linux
       - run: zip -r macos.zip macos