added publish steps

.github/workflows/node.js.yml

@@ -19,8 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12.x]
-        #, 14.x, 16.x]
+        node-version: [12.x, 14.x, 16.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
@@ -32,4 +31,18 @@ jobs:
     - run: npm ci
     - run: npm run build --if-present
     - run: npm test
- 
+
+  publish-npm:
+    needs: build-node
+    runs-on: ubuntu-latest
+    environment: npm
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+          registry-url: https://registry.npmjs.org/
+      - run: npm ci
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.npm_token}}