Update build.yml to run on PR target

Signed-off-by: Ashley <73482956+ascopes@users.noreply.github.com>

Author: ascopes

.github/workflows/build.yml

@@ -1,12 +1,9 @@
 name: Build
 
 on:
-  pull_request:
+  pull_request_target:
     branches:
       - main
-    types:
-      - opened
-      - synchronize
   push:
     branches:
       - main