enable CICD build for PR

.github/workflows/build_linux.yml

@@ -4,6 +4,9 @@ on:
     push:
       branches: 
        - main
+    pull_request:
+      branches: 
+       - main 
     
 jobs:
   appimage-builder:

.github/workflows/build_mac_arm64.yml

@@ -4,6 +4,9 @@ on:
     push:
       branches: 
        - main
+    pull_request:
+      branches: 
+       - main 
     
 jobs:
   build_osx_arm64:

.github/workflows/build_mac_x64.yml

@@ -4,6 +4,9 @@ on:
     push:
       branches: 
        - main
+    pull_request:
+      branches: 
+       - main 
     
 jobs:
   build_osx_x86_64:

.github/workflows/build_win.yml

@@ -4,6 +4,9 @@ on:
     push:
       branches: 
        - main
+    pull_request:
+      branches: 
+       - main 
 
 jobs:
   build_win64: