fix: rework config handling using koanf

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/ViRb3/sling/v2 v2.0.2
 	github.com/google/go-github/v33 v33.0.0
 	github.com/google/uuid v1.2.0
+	github.com/knadh/koanf v1.0.0
 	github.com/labstack/echo/v4 v4.3.0
 	github.com/pkg/errors v0.9.1
 	github.com/rs/zerolog v1.21.0

go.sum

@@ -1,40 +1,113 @@
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@@ -55,7 +128,14 @@ golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPh
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@@ -66,15 +146,25 @@ golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4 h1:4nGaVu0QrbjT/AK2PRLuQfQuh
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