Use lychee cache (#6161)

A few months ago, we enabled lychee cache in the SDK repo, to prevent
rate limit issues, but forgot to enable it here.
open-telemetry/opentelemetry-go#5160

---------

Co-authored-by: Robert Pająk <[email protected]>

Author: dmathieu

.github/workflows/links-fail-fast.yml

@@ -7,10 +7,22 @@ on:
 jobs:
   check-links:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - uses: actions/checkout@v4
 
+      - name: Restore lychee cache
+        uses: actions/cache@v4
+        with:
+          path: .lycheecache
+          key: cache-lychee-${{ github.sha }}
+          restore-keys: cache-lychee-
+
       - name: Link Checker
         uses: lycheeverse/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           fail: true
+          args: --max-concurrency 5 --cache --max-cache-age 1d .

.github/workflows/links.yml

@@ -10,13 +10,27 @@ on:
 jobs:
   check-links:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
     - name: Checkout Repo
       uses: actions/checkout@v4
 
+
+    - name: Restore lychee cache
+      uses: actions/cache@v4
+      with:
+        path: .lycheecache
+        key: cache-lychee-${{ github.sha }}
+        restore-keys: cache-lychee-
+
     - name: Link Checker
       id: lychee
       uses: lycheeverse/[email protected]
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+          args: --max-concurrency 1 --cache --max-cache-age 1d .
 
     - name: Create Issue From File
       if: steps.lychee.outputs.exit_code != 0