run trunk check action on PRs (#519)

As we no longer run check-on-PRs on forks, we're going back to the
legacy trunk action for checks in this PR.

After this merges, we will set the new job as required and remove the
required status from check-on-PRs.

---------

Co-authored-by: Samuel Lijin <[email protected]>

.github/workflows/pr.yaml

@@ -167,6 +167,25 @@ jobs:
             needs.detect_changes.outputs.tools-files }}
           trunk-token: ${{ secrets.TRUNK_DEBUGGER_TOKEN }}
 
+  trunk_check_runner:
+    name: Trunk Check runner [linux]
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    permissions:
+      checks: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          lfs: true
+
+      - name: Trunk Check
+        # trunk-ignore(semgrep/yaml.github-actions.security.third-party-action-not-pinned-to-commit-sha.third-party-action-not-pinned-to-commit-sha)
+        uses: trunk-io/trunk-action@main
+        env:
+          TRUNK_GITHUB_CHECK_RUN_TITLE: Trunk Check
+
   # Run Windows tests for modified linters and tools
   # TODO(Tyler): When this is more stabilized and we want to gate on it, we can make it part of the matrix above.
   windows_linter_tests: