Trigger blackbox tests with label (#24517)

Co-authored-by: Pascal Jufer <pascal-jufer@bluewin.ch>

.github/workflows/blackbox-pr.yml

@@ -0,0 +1,13 @@
+name: Check
+
+on:
+  pull_request:
+    types:
+      - synchronize
+      - labeled
+
+jobs:
+  blackbox-tests:
+    name: Blackbox Tests
+    if: contains(github.event.pull_request.labels.*.name, 'Run Blackbox')
+    uses: ./.github/workflows/blackbox.yml

.github/workflows/blackbox.yml

@@ -11,6 +11,7 @@ on:
       - package.json
       - pnpm-lock.yaml
       - .github/workflows/blackbox.yml
+  workflow_call:
 
 concurrency:
   group: blackbox-${{ github.ref }}

tests/blackbox/readme.md

@@ -1,3 +1,8 @@
 # Blackbox Tests
 
 See https://docs.directus.io/contributing/tests.html#running-blackbox-tests.
+
+## Run Blackbox Tests in Pull Requests
+
+Full blackbox tests run automatically when changes are merged into `main`. To trigger blackbox tests on a pull request,
+add the `Run Blackbox` label.