[CI] Stop messing with our contributor data with automated PRs (#3534)

* CC: Kowlin

* *sigh*

* Their own docs said that was allowed in expressions...

* python linting needs it too

* Quit with the dumb

* whoops

.github/workflows/tests.yml

@@ -1,5 +1,13 @@
 name: Tests
-on: [push, pull_request]
+on:
+  pull_request:
+  push:
+  repository_dispatch:
+    types:
+      - dispatched_test
+
+env:
+  ref: ${{ github.event.client_payload.ref || '' }}
 
 jobs:
     tox:
@@ -23,6 +31,8 @@ jobs:
       name: Tox - ${{ matrix.friendly_name }}
       steps:
         - uses: actions/checkout@v2
+          with:
+            ref: ${{ env.ref }}
         - name: Set up Python
           uses: actions/setup-python@v1
           with:
@@ -55,6 +65,8 @@ jobs:
             POSTGRES_USER: postgres
       steps:
         - uses: actions/checkout@v2
+          with:
+            ref: ${{ env.ref }}
         - name: Set up Python
           uses: actions/setup-python@v1
           with: