Moving basic CI to github actions

[axsaucedo]

What this PR does / why we need it:

Which issue(s) this PR fixes:

• Moves unit tests and lint into github actions

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[seldondev]

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[seldondev]

Tue Jan 26 18:21:14 UTC 2021
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2889/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2889 --build=2

[seldondev]

Tue Jan 26 18:21:10 UTC 2021
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2889/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2889 --build=1

[axsaucedo]

Lint and pr-build would not run successfully given they are being removed in favour of the github actions tests

[axsaucedo]

Merging PR as it's required in order to run gh actions, all tests pass locally running with https://github.com/nektos/act