feature: add github actions CI; optimized dockerfile for docker cache

[maze88]

• utilizes existing makefile for github actions CI workflow.
• swapped order of COPY and LABEL layers in dockerfile, to improve docker image cache utilization.
• remove unused legacy jenkinsfile.

[maze88]

LGTM. Please, split changes to Dockerfile and GitHub Actions into different commits

Thanks Ivan. Splitted.

[maze88]

/retest-all

[almaslennikov]

/retest-nic_operator_kind

[coveralls]

Pull Request Test Coverage Report for Build 8982088361

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 64.379%

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Totals
Change from base Build 8981102051:	0.5%
Covered Lines:	3264
Relevant Lines:	5070

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💛 - Coveralls

[almaslennikov]

/retest-nic_operator_helm

[almaslennikov]

/retest-nic_operator_kind