[llvm] [workflows] Only run code formatter on the main branch (PR #80348)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-github-workflow

Author: Tom Stellard (tstellar)

<details>
<summary>Changes</summary>

Modifying a cherry-picked patch to fix code formatting issues can be risky, so we don't typically do this.  Therefore, it's not necessary to run this job on the release branches.

---
Full diff: https://github.com/llvm/llvm-project/pull/80348.diff


1 Files Affected:

- (modified) .github/workflows/pr-code-format.yml (+3) 


``````````diff
diff --git a/.github/workflows/pr-code-format.yml b/.github/workflows/pr-code-format.yml
index 5223089ee8a93..c8fd541fd34db 100644
--- a/.github/workflows/pr-code-format.yml
+++ b/.github/workflows/pr-code-format.yml
@@ -1,5 +1,8 @@
 name: "Check code formatting"
 on: pull_request_target
+  branches:
+    - main
+
 permissions:
   pull-requests: write
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/80348