add caching

.github/workflows/build-and-release-desktop.yml

@@ -9,6 +9,9 @@ on:
   release:
     types: [created]
 
+env:
+  YARN_CACHE_FOLDER: ~/.yarn
+
 jobs:
   build_on_linux:
     name: "Build & release desktop app for ${{ matrix.os }}"
@@ -38,6 +41,17 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
 
+      - name: Caching
+        uses: actions/cache@v2
+        with:
+          path: |
+            ${{ env.YARN_CACHE_FOLDER }}
+            ~/.cache/electron
+            ~/.cache/electron-builder
+          key: ${{ runner.OS }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.OS }}-yarn-
+
       - name: "Install dependencies"
         run: yarn install --froze-lockfile
         working-directory: "desktop"