Split MD link checker into periodic and PR focused

Signed-off-by: killianmuldoon <[email protected]>

.github/workflows/lint-docs.yaml → .github/workflows/lint-docs-pr.yaml

@@ -19,3 +19,4 @@ jobs:
       with:
         use-quiet-mode: 'yes'
         config-file: .markdownlinkcheck.json
+        check-modified-files-only: 'yes'

.github/workflows/lint-docs-weekly.yml

@@ -0,0 +1,21 @@
+name: Check Markdown links
+
+on:
+  schedule:
+    - cron: "0 9 * * 1"
+  paths:
+      - '**.md'
+
+# Remove all permissions from GITHUB_TOKEN except metadata.
+permissions: {}
+
+jobs:
+  markdown-link-check:
+    name: Broken Links
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: gaurav-nelson/github-action-markdown-link-check@v1
+        with:
+          use-quiet-mode: 'yes'
+          config-file: .markdownlinkcheck.json