[llvm] [workflows] Add a new workflow for testing release branch CI (PR #81073)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-github-workflow

Author: Tom Stellard (tstellar)

<details>
<summary>Changes</summary>

Since we commit all changes to the release branch CI to main first, we need someway to test that these changes to main don't break the CI.

---
Full diff: https://github.com/llvm/llvm-project/pull/81073.diff


1 Files Affected:

- (added) .github/workflows/llvm-project-workflow-tests.yml (+31) 


``````````diff
diff --git a/.github/workflows/llvm-project-workflow-tests.yml b/.github/workflows/llvm-project-workflow-tests.yml
new file mode 100644
index 00000000000000..e65a3e86ec32dc
--- /dev/null
+++ b/.github/workflows/llvm-project-workflow-tests.yml
@@ -0,0 +1,31 @@
+# This workflow will test the llvm-project-tests workflow in PRs
+# targetting the main branch.  Since this workflow doesn't normally
+# run on main PRs, we need some way to test it to ensure new updates
+# don't break it.
+
+name: LLVM Workflow Test
+
+permissions:
+  contents: read
+
+on:
+    branches:
+      - 'main'
+    paths:
+      - '.github/workflows/llvm-project-tests.yml'
+      - '.github/workflows/llvm-project-workflow-tests.yml'
+
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+jobs:
+  llvm-test:
+    if: github.repository_owner == 'llvm'
+    name: Build and Test
+    uses: ./.github/workflows/llvm-project-tests.yml
+    with:
+      build_target: check-all
+      projects: clang;lld;libclc;lldb

``````````

</details>


https://github.com/llvm/llvm-project/pull/81073