CI (Linting, Testing, Building)

DONT MERGE THIS, I NEED MORE CLARIFICATION ON HOW THIS SHOULD BE STRUCTURED #98

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Run time

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Job	Run time
Lint (20.x, 1.21.x)	1m 36s
Build (20.x, 1.21.x)	54s
Test (20.x, 1.21.x)	52s
	3m 22s