add .github/workflows/url-check.yml

Author: janosh

.github/workflows/url-check.yml

@@ -0,0 +1,21 @@
+name: Check URLs
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v3
+
+      - name: Check URL
+        uses: urlstechie/urlchecker-action@master
+        with:
+          file_types: .md,.py,.rst  # file types to check URLs in
+          timeout: 5  # allowed timeout for requests to resolve, default = 5 sec
+          retry_count: 2