message: Cache yarn install step on nextjs build
diff: @@ -15,8 +15,21 @@ jobs:
  steps:
  - uses: actions/checkout@v2
  + - 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 # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
  + with:
  + path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
  + key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
  + restore-keys: |
  + ${{ runner.os }}-yarn-
  +
  - name: Install dependencies
  run: yarn
  + if: steps.yarn-cache.outputs.cache-hit != 'true'
  - name: Build frontend
  run: yarn build
  