Improvement build sequence (codecov)

[sukrosono]

Well i am too excited to contribute to chai, so previous work #1073 seems have better way.
It's just 300kb , but in my point of view it save developers time to install it and save small disk space 😄 .

The better way is via bash.

[keithamus]

Closing because:

I feel really uncomfortable downloading and executing aribtrary bash on my local machine, and on CI (where we have secret tokens like account passwords). The 300k is only downloaded for developers, so I think it's adequete to keep it. I'll close this issue, you did the right thing in the original PR, and changing to running arbitrary bash would be a bad move IMO.