pull req checkout

Author: retorquere

.github/workflows/sheldon.yaml

@@ -30,6 +30,16 @@ jobs:
       with:
         path: pull-request
         ref: ${{ github.event.pull_request.head.sha }}
+    - run: cd pull-request && git status
+
+    - name: Checkout pull-request from submitter repo
+      uses: actions/checkout@v2
+      if: "! contains(github.event.pull_request.labels.*.name, 'safe to test')"
+      with:
+        repository: ${{ github.event.pull_request.head.repo.full_name }}
+        path: pull-request-2
+        ref: ${{ github.event.pull_request.head.ref }}
+    - run: cd pull-request-2 && git status
 
     - name: Check for relevant changes
       uses: dorny/paths-filter@v2