[llvm] [Flang] Github action to check for integration tests (PR #221766)

[via llvm-commits]

================
@@ -0,0 +1,104 @@
+name: Flang integration test check
+
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+    paths:
+      - "flang/test/**"
+
+# This workflow only inspects file patches through the GitHub API. In
+# particular, it must not check out or execute code from the pull request.
----------------
github-advanced-security[bot] wrote:

## zizmor / 

use of fundamentally insecure workflow trigger: pull_request_target is almost always used insecurely

[Show more details](https://github.com/llvm/llvm-project/security/code-scanning/2353)

https://github.com/llvm/llvm-project/pull/221766