chore(setup): add yarn cache on workflow runs

.github/workflows/desktop.windows.sign.yml

@@ -19,7 +19,8 @@ jobs:
         with:
           registry-url: 'https://registry.npmjs.org'
           node-version-file: '.nvmrc'
-      - run: yarn install
+          cache: 'yarn'
+      - run: yarn install --immutable
       - run: yarn build:desktop
       - run: yarn run webpack --config desktop.webpack.prod.js
       - run: echo APP_VERSION=$(node -p "require('./package.json').version") >> $GITHUB_ENV
@@ -47,6 +48,7 @@ jobs:
         with:
           registry-url: 'https://registry.npmjs.org'
           node-version-file: '.nvmrc'
+          cache: 'yarn'
       - uses: actions/download-artifact@v3
         with:
           name: assets