ci: add caching

.github/workflows/test-build.yml

@@ -19,6 +19,30 @@ jobs:
       run: sudo apt-get update && sudo apt-get install -y libwebkit2gtk-4.0-dev libssl-dev
       if: runner.os == 'Linux'
 
+    - name: Get yarn cache directory path
+      id: yarn-cache-dir-path
+      run: echo "::set-output name=dir::$(yarn cache dir)"
+
+    - name: Get cargo cache directory path
+      id: cargo-cache-dir-path
+      run: echo "::set-output name=dir::$HOME/.cargo/"
+
+    - uses: actions/cache@v2
+      id: yarn-cache
+      with:
+        path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+        key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-yarn-
+
+    - uses: actions/cache@v2
+      id: cargo-cache
+      with:
+        path: ${{ steps.cargo-cache-dir-path.outputs.dir }}
+        key: ${{ runner.os }}-cargo-${{ hashFiles('Cargo.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-cargo-
+
     - uses: actions/setup-node@v1
       with:
         node-version: '12.x'