Switch from Travis to Github Actions

[rajat19]

Can we switch from travis to github actions instead ?

Pros-

1. no need to maintain seperate service
2. automated deployments is easy
3. currently we use travis only for test run -> easily done using github actions

Cons-

1. travis has support for api (but we don't use travis api -> so no issue)

More on this https://knapsackpro.com/ci_comparisons/github-actions/vs/travis-ci

Apart from just running tests and build
other things can also be implemented