[WIP] add viper to manage envvars and cfg files

Former-commit-id: 99d241dc790629791b67b7b2ce20a10341a1c1e7 [formerly 08e8410bffdb50134a2d6ccbe853b25d4c4d3fc6] [formerly f32b18d9acb42ee1988c49b7980a16a606cee142 [formerly 1080bfde68]]
Former-commit-id: 318c4f159697e896bcf824e274907c5c03046bf0 [formerly 82533ae817673dfab8d56533f15a9931c0c74c1e]
Former-commit-id: ece42aa8e8c7480a5a21614b6ca397b71a01e1fa

cmd/config_init.go

@@ -9,6 +9,7 @@ import (
 	"github.com/asdine/storm"
 	"github.com/filebrowser/filebrowser/v2/settings"
 	"github.com/spf13/cobra"
+	v "github.com/spf13/viper"
 )
 
 func init() {
@@ -28,6 +29,7 @@ to the defaults when creating new users and you don't
 override the options.`,
 	Args: cobra.NoArgs,
 	Run: func(cmd *cobra.Command, args []string) {
+		databasePath := v.GetString("database")
 		if _, err := os.Stat(databasePath); err == nil {
 			panic(errors.New(databasePath + " already exists"))
 		}