Update ci.yml

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: ci 
+name: ci
 on:
   push:
     branches:
@@ -7,10 +7,21 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v3
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          sparse-checkout: |
+            docs
+      - uses: actions/setup-python@v5
         with:
           python-version: 3.x
+      - run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV
+      - uses: actions/cache@v4
+        with:
+          key: mkdocs-material-${{ env.cache_id }}
+          path: .cache
+          restore-keys: |
+            mkdocs-material-
       - run: pip install mkdocs-material
       - run: pip install pymdown-extensions
       - run: pip install mkdocs-minify-plugin