ci: also run compile on main push, only create Release on tag push

Author: small-rose

.github/workflows/maven.yml

@@ -2,6 +2,7 @@ name: Build & Release
 
 on:
   push:
+    branches: [ main ]
     tags: [ 'v*' ]
 
 jobs:
@@ -24,6 +25,7 @@ jobs:
         run: mvn -B clean package --file pom.xml -DskipTests
 
       - name: Create Release
+        if: startsWith(github.ref, 'refs/tags/')
         uses: softprops/action-gh-release@v2
         with:
           tag_name: ${{ github.ref_name }}