build: revert to yarn 1

.github/workflows/release.yml

@@ -1,30 +1,37 @@
 # .github/workflows/release.yml
 name: 'Release'
+
 on:
   push:
     branches:
       - master
+
 jobs:
   release:
     name: Release
     runs-on: ubuntu-latest
+
     strategy:
       matrix:
         node-version: [14.x]
+
     steps:
       - uses: actions/checkout@v2
+
       - name: Set up Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v2-beta
         with:
           node-version: ${{ matrix.node-version }}
           registry-url: 'https://registry.npmjs.org'
+
       - name: Set up Yarn
         id: yarn-cache-dir-path
         run: |
           npm i -g yarn
-          yarn set version latest
+          yarn set version 1.x
           yarn config set enableTelemetry 0
           echo "::set-output name=dir::$(yarn cache dir)"
+
       - name: Cache Yarn
         uses: actions/cache@v2
         with:
@@ -37,14 +44,17 @@ jobs:
       - name: Install Dependencies
         run: |
           npm i -g firebase-tools
-          yarn --immutable
+          yarn --pure-lockfile
+
       - name: Build
         run: yarn build
+
       - name: Semantic Release
         run: yarn semantic-release
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Deploy
         run: yarn deploy-ci
         env: