chore(gha): add ms-testers.yml GitHub workflow

.github/workflows/ms-testers.yml

@@ -0,0 +1,34 @@
+# DO NOT EDIT: BEGIN
+# This snippet has been inserted automatically by mobsuccessbot, do not edit!
+# If changes are needed, update the action ms-testers in
+# https://github.com/mobsuccess-devops/github-mobsuccess-policy
+name: Linear ms-testers
+
+on:
+  merge_group:
+    types:
+      - checks_requested
+
+  pull_request:
+    types:
+      - assigned
+      - unassigned
+      - opened
+      - reopened
+      - synchronize
+      - edited
+
+jobs:
+  LinearMsTesters:
+    runs-on: ubuntu-latest
+    timeout-minutes: 3
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+      cancel-in-progress: true
+    steps:
+      - uses: mobsuccess-devops/github-actions-linear@master
+        with:
+          action: propagate-ms-testers-assignee-to-linear
+          linearApiKey: ${{ secrets.LINEAR_API_KEY }}
+          githubToken: ${{ secrets.GITHUB_TOKEN }}
+# DO NOT EDIT: END