Added iwyu-test branch trigger that uploads patch without a PR.

Author: 23rd

.github/workflows/iwyu.yml

@@ -9,6 +9,8 @@ on:
         description: 'Branch to clean up.'
         type: string
         default: dev
+  push:
+    branches: [iwyu-test]
 
 permissions:
   contents: write
@@ -28,7 +30,7 @@ jobs:
     steps:
       - name: Resolve target ref.
         id: target
-        run: echo "ref=${{ inputs.ref || 'dev' }}" >> $GITHUB_OUTPUT
+        run: echo "ref=${{ inputs.ref || (github.event_name == 'push' && github.ref_name) || 'dev' }}" >> $GITHUB_OUTPUT
 
       - name: Clone.
         uses: actions/checkout@v6
@@ -179,7 +181,7 @@ jobs:
   open-pr:
     name: Open pull request
     needs: [generate, verify-linux, verify-mac, verify-win]
-    if: needs.generate.outputs.has_changes == 'true'
+    if: needs.generate.outputs.has_changes == 'true' && github.event_name != 'push'
     runs-on: ubuntu-latest
 
     steps: