added link checking

.github/workflows/check_links.yml

@@ -0,0 +1,28 @@
+name: Check Links
+
+on:
+  push:
+    branches:
+      - '*'
+  pull_request:
+    branches:
+      - '*'
+jobs:
+  check-links:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: 16
+
+    - name: Install dependencies
+      run: |
+        npm install -g markdown-link-check
+
+    - name: Check links in Markdown files
+      run: find . -name '*.md' -print0 | xargs -0 -n1 markdown-link-check -q -c .markdown-link-check.json

.markdown-link-check.json

@@ -0,0 +1,26 @@
+{
+  "ignorePatterns": [
+    {
+      "pattern": "^#"
+    },
+    {
+      "pattern": "^https://iam.nih.gov"
+    }
+  ],
+  "replacementPatterns": [
+    {
+      "pattern": "^/docs",
+      "replacement": "https://github.com/STRIDES/NIHCloudLabGCP/tree/main/docs"
+    },
+    {
+      "pattern": "^/tutorials",
+      "replacement": "https://github.com/STRIDES/NIHCloudLabGCP/tree/main/tutorials"
+    }
+
+  ],
+  "timeout": "20s",
+  "retryOn429": true,
+  "retryCount": 5,
+  "fallbackRetryDelay": "30s",
+  "aliveStatusCodes": [200, 206]
+}