ci: add housekeeping lychee cache

.github/workflows/housekeeping.yml

@@ -37,6 +37,12 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
+      - uses: actions/cache@v3
+        with:
+          path: .lycheecache
+          key: housekeeping-find-broken-links-${{ github.sha }}
+          restore-keys: housekeeping-find-broken-links-
+
       - name: Check Links
         id: lychee
         uses: lycheeverse/lychee-action@v1.5.1
@@ -53,6 +59,8 @@ jobs:
             --exclude 'https://dir.xiph.org/cgi-bin/yp-cgi'
             --exclude 'https://radio.indymedia.org/cgi-bin/yp-cgi'
             --exclude 'https://www.ascap.com'
+            --cache
+            --max-cache-age 2d
           fail: true
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}