ci: use Yarn instead of NPM (#277)

Author: dunglas

.github/workflows/npm.yml renamed to .github/workflows/release.yml

@@ -1,20 +1,21 @@
-name: Deploy to NPM
+name: Release
 
 on:
   push:
     tags:
-      - '*'
+      - 'v*'
+
 jobs:
-  publish:
+  release:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v1
       with:
         node-version: '15'
         registry-url: 'https://registry.npmjs.org'
-    - run: npm install
-    - run: npm build
+    - run: yarn install
+    - run: yarn build
     - run: npm publish
       env:
         NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}