chore: improve Yarn 2 cache on CI (#11781)

* chore: add cache actions for yarn

* chore: validate yarn cache before CI jobs

* chore: remove restore-keys as cache-hit must be true

* chore: disable post install scripts in yarn-cache validate

* chore: use pnp linker in validate-yarn-cache step

* chore: add job names

.github/workflows/ci.yml

@@ -1,15 +1,50 @@
-name: Node CI
+name: CI
 
 on: [push, pull_request]
 
 jobs:
-  test:
+  prepare-yarn-cache:
+    name: Prepare Cache
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Use Node.js latest
         uses: actions/setup-node@v2-beta
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn config get cacheFolder)"
+      - 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: |
+            ${{ runner.os }}-yarn-
+      - name: Update Yarn cache
+        if: steps.yarn-cache.outputs.cache-hit != 'true'
+        env:
+          YARN_ENABLE_SCRIPTS: false # disable post-install scripts
+          YARN_NODE_LINKER: pnp # use pnp linker for better performance: it meant to update yarn cache only
+        run: |
+          yarn install --immutable
+
+  test-coverage:
+    name: Test on Node.js Latest
+    needs: prepare-yarn-cache
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Use Node.js latest
+        uses: actions/setup-node@v2-beta
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn config get cacheFolder)"
+      - uses: actions/cache@v2
+        with:
+          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('yarn.lock') }}
       - name: Generate coverage report
         run: |
           make -j test-ci-coverage
@@ -19,6 +54,8 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
 
   legacy-node-version-test:
+    name: Test on Node.js
+    needs: prepare-yarn-cache
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -28,6 +65,13 @@ jobs:
         uses: actions/checkout@v2
       - name: Use Node.js latest
         uses: actions/setup-node@v2-beta # Build Babel on latest node versions
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn config get cacheFolder)"
+      - uses: actions/cache@v2
+        with:
+          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('yarn.lock') }}
       - name: Build
         run: |
           BABEL_ENV=test-legacy make -j bootstrap