Tag check.

Author: chadcarlson

.github/workflows/npm-publish.yaml

@@ -14,6 +14,8 @@ jobs:
               node-version: '10.x'
               registry-url: 'https://registry.npmjs.org'
         - run: npm install
-        - run: npm publish
+        - if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
           env:
               NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+          run: npm publish
+