Add a step to download yarn

.gitea/workflows/test.yml

@@ -19,11 +19,14 @@ jobs:
         node-version: [18.x]
     steps:
       - uses: actions/checkout@v3
+      - name: Download yarn
+        run: |
+          curl -fsSL -o /usr/local/bin/yarn https://github.com/yarnpkg/yarn/releases/download/v1.22.21/yarn-1.22.21.js
+          chmod +x /usr/local/bin/yarn
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
-          registry-url: 'https://registry.npmjs.org/'
 
       - name: Install dependencies and build
         run: yarn && yarn build