Add CI step to publish glean

Only when a new tag is created.

Author: brizental

.circleci/config.yml

@@ -65,6 +65,21 @@ jobs:
           name: Verify no Javascript errors found in Qt
           command: bin/qt-js-check.sh
 
+  publish:
+    docker:
+      - image: cimg/node:14.13.1
+    steps:
+      - checkout
+      - run:
+          name: Install Javascript dependencies
+          command: npm --prefix ./glean install
+      - run:
+          name: NPM Authentication
+          command: echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" > .npmrc
+      - run:
+          name: Publish to npm
+          command: export PATH=.:$PATH && (cd glean && npm publish)
+
 
 workflows:
   version: 2
@@ -73,6 +88,15 @@ workflows:
       - lint
       - unit-tests
       - check-qt-js
+      - publish:
+          requires:
+            - lint
+            - unit-tests
+          filters:
+            branches:
+              ignore: /.*/
+            tags:
+              only: /v[0-9]+(\.[0-9]+)*/
       # Comment this job away until Bug 1681899 is resolved.
       # - check-size:
       #     filters: