check-links added to repo

.github/workflows/check-links.yaml

@@ -0,0 +1,46 @@
+name: check-links
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref }}
+jobs:
+  changedfiles:
+    name: changed files
+    runs-on: ubuntu-latest
+    env:
+      PR_HEAD: ${{ github.event.pull_request.head.sha }}
+    outputs:
+      md: ${{ steps.changes.outputs.md }}
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+        with:
+          fetch-depth: 0
+      - name: Get changed files
+        id: changes
+        run: |
+          echo "md=$(git diff --name-only --diff-filter=ACMRTUXB $(git merge-base origin/main $PR_HEAD) $PR_HEAD | grep .md$ | xargs)" >> $GITHUB_OUTPUT
+
+  check-links:
+    runs-on: ubuntu-latest
+    needs: changedfiles
+    if: ${{needs.changedfiles.outputs.md}}
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+        with:
+          fetch-depth: 0
+
+      - name: Install markdown-link-check
+        run: npm install
+
+      - name: Run markdown-link-check
+        run: |
+          npx --no -- markdown-link-check \
+            --verbose \
+            --config .github/workflows/check_links_config.json \
+            ${{needs.changedfiles.outputs.md}} \
+            || { echo "Check that anchor links are lowercase"; exit 1; }

.github/workflows/check_links_config.json

@@ -0,0 +1,28 @@
+{
+    "ignorePatterns": [
+        {
+            "pattern": "http(s)?://\\d+\\.\\d+\\.\\d+\\.\\d+"
+        },
+        {
+            "pattern": "http(s)?://localhost"
+        },
+        {
+            "pattern": "http(s)?://example.com"
+        },
+        {
+            "pattern": "https://docs.aws.amazon.com"
+        },
+        {
+            "pattern": "https://console.aws.amazon.com"
+        }
+    ],
+    "aliveStatusCodes": [429, 200],
+    "httpHeaders": [
+        {
+            "urls": ["https://docs.aws.amazon.com", "https://docs.github.com/"],
+            "headers": {
+                "Accept-Encoding": "zstd, br, gzip, deflate"
+            }
+        }
+    ]
+}