Test main build and release build.

Author: zzhlogin

.github/workflows/main-build.yml

@@ -1,10 +1,8 @@
 name: Java Agent Main Build
 on:
-  workflow_dispatch:
-    inputs:
-      version:
-        description: The version to tag the release with, e.g., 1.2.0, 1.2.1-alpha.1
-        required: false
+  pull_request:
+    branches:
+      - main
   push:
     branches:
       - main

.github/workflows/release-build.yml

@@ -1,5 +1,8 @@
 name: Release Build
 on:
+  pull_request:
+    branches:
+      - main
   workflow_dispatch:
     inputs:
       version: