github: add action to check for broken links in Markdown, HTML

Signed-off-by: Victor Login <batazor111@gmail.com>

.github/workflows/link-check.yml

@@ -0,0 +1,44 @@
+name: Links
+
+on:
+  repository_dispatch:
+  workflow_dispatch:
+  schedule:
+    # At 09:00 on Monday: https://crontab.guru/#0_9_*_*_1
+    - cron:  '0 9 * * 1'
+
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Restore lychee cache
+        uses: actions/cache@v3
+        with:
+          path: .lycheecache
+          key: cache-lychee-${{ github.sha }}
+          restore-keys: cache-lychee-
+
+      - name: Link Checker
+        id: lychee
+        uses: lycheeverse/lychee-action@d322e38893906cef8788eefe9c63694c562c7dfa # for v1.6.1
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        with:
+          args: "--cache --max-cache-age 1d"
+
+      - name: Save lychee cache
+        uses: actions/cache/save@v3
+        if: always()
+        with:
+          path: .lycheecache
+          key: ${{ steps.restore-cache.outputs.cache-primary-key }}
+
+      - name: Create Issue From File
+        if: env.lychee_exit_code != 0
+        uses: peter-evans/create-issue-from-file@v4
+        with:
+          title: Link Checker Report
+          content-filepath: ./lychee/out.md
+          labels: report, automated issue