Update ci.yml

Author: DenisSolicen

.github/workflows/ci.yml

@@ -14,10 +14,18 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: 3.x
-      - uses: actions/cache@v3
+            - name: Set up build cache
+      - uses: actions/cache/restore@v4
         with:
-          key: ${{ github.ref }}
-          path: .cache
+          key: mkdocs-material-${{ hashfiles('.cache/**') }}
+          path: ~/.cache
+          restore-keys: |
+            mkdocs-material-
       - run: pip install mkdocs-material
       - run: pip install pillow cairosvg
-      - run: mkdocs gh-deploy --force
+      - run: mkdocs gh-deploy --force
+        - name: Save build cache
+      - uses: actions/cache/save@v4
+        with:
+          key: mkdocs-material-${{ hashfiles('.cache/**') }}
+          path: ~/.cache