ci: add pull_request_target trigger for Dependabot CI compatibility

Author: ancongui

.github/workflows/ci.yml

@@ -4,6 +4,8 @@ on:
     branches: [develop]
   pull_request:
     branches: [develop, main]
+  pull_request_target:
+    branches: [develop, main]
   workflow_dispatch:
     inputs:
       triggered-by:
@@ -12,7 +14,8 @@ on:
         type: string
 jobs:
   build:
+    if: github.event_name \!= 'pull_request_target' || github.actor == 'dependabot[bot]'
     uses: fireflyframework/.github/.github/workflows/java-ci.yml@main
     with:
       java-version: '25'
-
+      checkout-ref: ${{ github.event_name == 'pull_request_target' && github.event.pull_request.head.sha || '' }}