Update npmpublish.yml

Author: KadoBOT

.github/workflows/npmpublish.yml

@@ -12,8 +12,8 @@ jobs:
       - uses: actions/setup-node@v1
         with:
           node-version: 12
-      - run: npm ci
-      - run: npm test
+      - run: yarn install --frozen-lockfile
+      - run: yarn run test
 
   publish-npm:
     needs: build
@@ -24,7 +24,7 @@ jobs:
         with:
           node-version: 12
           registry-url: https://registry.npmjs.org/
-      - run: npm ci
-      - run: npm publish
+      - run: yarn install --frozen-lockfile
+      - run: yarn publish
         env:
           NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}