Publish on npm using CI pipeline

Closes #44 (closed)

.gitlab-ci.yml

@@ -3,6 +3,7 @@ stages:
   - test
   - build
   - deploy
+  - release
 
 # Prevent detached merge request pipelines
 # https://docs.gitlab.com/ee/ci/merge_request_pipelines/
@@ -104,3 +105,16 @@ stop-surge:
 
   script:
     - surge teardown ${CI_ENVIRONMENT_URL}
+
+release-private:
+  stage: release
+
+  # Publish only on tags
+  only:
+    - tags
+
+  before_script:
+    - echo '//registry.npmjs.org/:_authToken=${NPM_TOKEN}' > .npmrc
+
+  script:
+    - npm publish --access public