test: migrate ci from travis to github actions

[iChenLei]

Github Actions

https://github.com/iChenLei/miniprogram-simulate/actions/runs/2462182352 click and view github actions ci

CheckList

• update karma test suite
• add github actions ci config
• remove travis-ci , Since June 15th, 2021, the building on travis-ci.org is ceased. Please use travis-ci.com from now on.
• add github actions ci badge
• set karma config signleRun to true, more detail -> --singleRun

cc @JuneAndGreen

Please use Squash and merge button to merge pull request for clean commit

[iChenLei]

I am eslint-plugin-wxml author, also maintain WXML - Language Service, the most popular wechat miniprogram extension on VSCode marketplace . I want join the wechat-miniprogram team to maintain wechat miniprogram packages, help all miniprogram developer to improve productivity. How can I do it ? @JuneAndGreen

[JuneAndGreen]

thx for your pr🌹

[JuneAndGreen]

I am sorry that we cannot allow you join it, because this organization is the official org for wechat miniprogram fed.But if you are interested in our packages and you found some can be improved, you can also create pull requests.

Thank you and sorry again for your proposal. That's a pity! 🌹