Setup CI (#1) #7

Job	Run time
Check formatting using Prettier	5s
Install deps and compile (21.3, 1.11, ubuntu-20.04)	24s
Install deps and compile (26.2, 1.16, ubuntu-latest)	26s
Format (21.3, 1.11, ubuntu-20.04)	8s
Format (26.2, 1.16, ubuntu-latest)	13s
Deps audit (21.3, 1.11, ubuntu-20.04)	11s
Credo (21.3, 1.11, ubuntu-20.04)	12s
Dialyzer (21.3, 1.11, ubuntu-20.04)	5m 49s
Deps audit (26.2, 1.16, ubuntu-latest)	20s
Dialyzer (26.2, 1.16, ubuntu-latest)	1m 50s
Credo (26.2, 1.16, ubuntu-latest)	14s
Hex audit (21.3, 1.11, ubuntu-20.04)	12s
Test (21.3, 1.11, ubuntu-20.04)	8s
Hex audit (26.2, 1.16, ubuntu-latest)	10s
Check unused deps (21.3, 1.11, ubuntu-20.04)	7s
Test (26.2, 1.16, ubuntu-latest)	14s
Check unused deps (26.2, 1.16, ubuntu-latest)	14s
	10m 57s

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