ci: add lychee cache (#5616)

Author: davidhewitt

.github/workflows/netlify-build.yml

@@ -39,6 +39,13 @@ jobs:
           TAG_NAME="${GITHUB_REF##*/}"
           echo "tag_name=${TAG_NAME}" >> $GITHUB_OUTPUT
 
+      - name: Restore lychee cache
+        id: restore-cache
+        uses: actions/cache/restore@v4
+        with:
+          path: .lycheecache
+          key: lychee
+
       # This builds the book in target/guide/.
       - name: Build the guide
         run: |
@@ -49,6 +56,13 @@ jobs:
           # allows lychee to get better rate limits from github
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Save lychee cache
+        uses: actions/cache/save@v4
+        if: ${{ github.ref == 'refs/heads/main' || contains(github.event.pull_request.labels.*.name, 'CI-save-pr-cache') }}
+        with:
+          path: .lycheecache
+          key: ${{ steps.restore-cache.outputs.cache-primary-key }}
+
       # We store the versioned guides on GitHub's gh-pages branch for convenience
       # (the full gh-pages branch is pulled in the build-netlify-site step)
       - name: Deploy the guide

.gitignore

@@ -28,3 +28,4 @@ coverage.json
 netlify_build/
 .nox/
 .vscode/
+.lycheecache

noxfile.py

@@ -737,6 +737,8 @@ def check_guide(session: nox.Session):
         str(PYO3_GUIDE_SRC),
         *remap_args,
         "--accept=200,429",
+        "--cache",
+        "--max-cache-age=7d",
         *session.posargs,
         external=True,
     )
@@ -754,6 +756,8 @@ def check_guide(session: nox.Session):
         "--accept=200,429",
         # reduce the concurrency to avoid rate-limit from `pyo3.rs`
         "--max-concurrency=32",
+        "--cache",
+        "--max-cache-age=7d",
         *session.posargs,
         external=True,
     )