ci: add github workflows for test/build/publish

[aquariuslt]

This PR add 2 workflows:

• ci: will trigger ci step when push on any branch, like travis ci config, executing npm install & npm test

• publish: will trigger when create a release from github repository release tab, autorun npm install, npm run build and npm publish

To Apply publish workflow, npm packages admin suppose to generate a publish token and set as SECRET NODE_AUTH_TOKEN at repository. Refer to Github Actions: Setup Node

Todo:

• when calling postpublish step, it will trigger deploy github pages. It needs to be integrated with github actions

[coveralls]

Coverage remained the same at 81.342% when pulling 56fecbd on aquariuslt:master into f3c9d6d on weui:master.