feat: support whole config as env (#6336)

* fix existing env vars

* feat: support all config by env

* cleanup

* remove system users hook

* decode system users in setup

cmd/hooks/complex.go

@@ -0,0 +1,35 @@
+package hooks
+
+import (
+	"encoding/json"
+	"net/http"
+	"reflect"
+)
+
+func SliceTypeStringDecode[T any](from, to reflect.Value) (any, error) {
+	into := make([]T, 0)
+	return complexTypeStringDecodeHook(from, to, into)
+}
+
+func MapTypeStringDecode[K ~string | ~int, V any](from, to reflect.Value) (any, error) {
+	into := make(map[K]V, 0)
+	return complexTypeStringDecodeHook(from, to, into)
+}
+
+func MapHTTPHeaderStringDecode(from, to reflect.Value) (any, error) {
+	into := http.Header{}
+	return complexTypeStringDecodeHook(from, to, into)
+}
+
+func complexTypeStringDecodeHook(from, to reflect.Value, out any) (any, error) {
+	fromInterface := from.Interface()
+	if to.Type() != reflect.TypeOf(out) {
+		return fromInterface, nil
+	}
+	data, ok := fromInterface.(string)
+	if !ok {
+		return fromInterface, nil
+	}
+	err := json.Unmarshal([]byte(data), &out)
+	return out, err
+}