Migrate comit-rs to Circle CI

[D4nte]

Remove Travis configuration file and Make Circle CI successful build a mandatory requirement.

DoD:

• Check Travis subscription model
• Update mergify config
• Remove .travis.yml file
• Make Circle CI Successful build check mandatory to merge PR in GitHub
• Create issue to track the testcontainer optimisation discussed below
• Slack integration

[thomaseizinger]

Travis cannot test on MacOS because docker is not available there.

[D4nte]

What is blocking this ticket? :) "good first issue"?

[bonomat]

Nothing really, I have a working version in here #942 .

[D4nte]

I thought there was a dependency on a testcontainers change. @thomaseizinger could you create an issue to track the testcontainers change.
I suggest we keep this one in mind for the next sprint.

[thomaseizinger]

@thomaseizinger could you create an issue to track the testcontainers change.

Done: testcontainers/testcontainers-rs#89

[bonomat]

Even with the non-optimzed setup, CircleCI has a better performance than Travis.

• https://circleci.com/gh/comit-network: ~12 minutes
• https://travis-ci.com/comit-network/comit-rs/builds: ~20 minutes

I would opt for migrate over to CircleCI now and invest some time into testcontainers/testcontainers-rs#89 to get an even better performance.

[D4nte]

Yes go for it.