cache/restore yarn cache when build image

.github/workflows/build-rc.yml

@@ -14,6 +14,14 @@ jobs:
     steps:
     - uses: actions/checkout@v1
 
+    - name: Cache/Restore yarn cache
+      uses: actions/cache@v1
+      with:
+        path: /usr/local/share/.cache/yarn
+        key: ${{ runner.os }}-yarn-${{ matrix.node-version }}-${{ hashFiles('**/yarn.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-yarn-${{ matrix.node-version }}-
+
     - name: Set up Docker Buildx
       uses: crazy-max/ghaction-docker-buildx@v1.0.4
 

.github/workflows/build.yml

@@ -22,6 +22,14 @@ jobs:
         [[ ${{ matrix.flavor }} = "nocdn" ]] && suffix="-nocdn" || suffix=""
         echo ::set-env name=SUFFIX::$suffix
 
+    - name: Cache/Restore yarn cache
+      uses: actions/cache@v1
+      with:
+        path: /usr/local/share/.cache/yarn
+        key: ${{ runner.os }}-yarn-${{ matrix.node-version }}-${{ hashFiles('**/yarn.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-yarn-${{ matrix.node-version }}-
+
     - name: Set up Docker Buildx
       uses: crazy-max/ghaction-docker-buildx@v1.0.4