chore: i hate workflows

Author: GalvinPython

.github/workflows/build.yml

@@ -4,10 +4,10 @@
 # against bad commits.
 
 name: build
+
 on:
   pull_request:
-  push:
-    paths:
+    paths: &build_paths
       - '.github/workflows/build.yml'
       - 'build.gradle'
       - 'gradle.properties'
@@ -17,6 +17,10 @@ on:
       - 'settings.gradle'
       - 'src/**'
 
+  push:
+    branches: [main]
+    paths: *build_paths
+
 concurrency:
   group: "java-build-${{ github.ref }}"
   cancel-in-progress: true