[Github] Add Workflow to test Unprivileged Download Artifact Action

[boomanaiden154]

Since this is a composite action, we do not get any testing currently
when updating the action. This patch adds a simple workflow to test the
action so we can ensure we do not break it when modifying it.

[llvmbot]

@llvm/pr-subscribers-github-workflow

Author: Aiden Grossman (boomanaiden154)

Changes

Since this is a composite action, we do not get any testing currently
when updating the action. This patch adds a simple workflow to test the
action so we can ensure we do not break it when modifying it.

---

Full diff: https://github.com/llvm/llvm-project/pull/167434.diff

1 Files Affected:

• (added) .github/workflows/test-unprivileged-download-artifact.yml (+47)

diff --git a/.github/workflows/test-unprivileged-download-artifact.yml b/.github/workflows/test-unprivileged-download-artifact.yml
new file mode 100644
index 0000000000000..cb37cfebf1dc9
--- /dev/null
+++ b/.github/workflows/test-unprivileged-download-artifact.yml
@@ -0,0 +1,47 @@
+name: Test Unprivileged Download Artifact Action
+
+permissions:
+  contents: read
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - .github/workflows/test-unprivileged-download-artifact.yml
+      - '.github/workflows/unprivileged-download-artifact/**'
+  pull_request:
+    paths:
+      - .github/workflows/test-unprivileged-download-artifact.yml
+      - '.github/workflows/unprivileged-download-artifact/**'
+
+jobs:
+  test-unprivileged-download-artifact:
+    name: Test Unprivileged Download Artifact
+    if: github.repository_owner == 'llvm'
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout LLVM
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          sparse-checkout: |
+            .github/workflows/
+      - name: Create Test File
+        run: |
+          echo "test" > comment
+      - name: Upload Test File
+        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+        with:
+          name: workflow-args
+          path: |
+            comments
+      - name: Download Artifact
+        uses: ./.github/workflows/unprivileged-download-artifact
+        id: download-artifact
+        with:
+          run-id: ${{ github.run_id }}
+          artifact-name: workflow-args
+      - name: Assert That Contents are the Same
+        run: |
+          cat test
+          cat workflow-args