Moved config set/unset to internal/config/modify.go as Store and Purge.

internal/config/load.go

@@ -3,6 +3,7 @@ package config
 import (
 	"fmt"
 	"log/slog"
+	"strings"
 
 	"github.com/joho/godotenv"
 	"github.com/spf13/viper"
@@ -33,6 +34,7 @@ func loadConfig(cfgFile string) error {
 	LoadDefaultConfig()
 
 	viper.SetEnvPrefix(EnvPrefix)
+	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
 	viper.AutomaticEnv() // read in environment variables that match
 
 	err := viper.ReadInConfig()