Enable "Blocking Issues" github action

Details:
https://github.com/Levi-Lesches/blocking-issues
Senses when you type "Blocked by: #N" in an issue or PR.

Author: mandolaerik

.github/workflows/blocking-issues.yml

@@ -0,0 +1,15 @@
+name: Blocking Issues
+
+on:
+  issues:
+    types: [closed]
+  pull_request_target:
+    types: [opened, edited]
+
+jobs:
+  blocking_issues:
+    runs-on: ubuntu-latest
+    name: Checks for blocking issues
+
+    steps:
+      - uses: Levi-Lesches/[email protected]