Add authentication #12

Job	Run time
Check formatting using Prettier	18s
Check formatting using Prettier	18s
Install deps and compile	1m 9s
Install deps and compile	1m 9s
Credo	13s
Credo	13s
Deps audit	16s
Deps audit	16s
Format	14s
Format	14s
Dialyzer	2m 56s
Dialyzer	2m 56s
Hex audit	16s
Hex audit	16s
Migrations	37s
Migrations	37s
Security check	11s
Security check	11s
Test	28s
Test	38s
Check unused deps	12s
Check unused deps	12s
	13m 50s

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