Allow configuration by environment

internal/configuration/config.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	_ "embed"
 	"log"
+	"strings"
 	"sync"
 
 	"github.com/getsentry/sentry-go"
@@ -32,7 +33,8 @@ func Global() Configuration {
 func Initialize() {
 	setDefaults()
 	viper.SetConfigName("fermentord")
-	viper.SetConfigType("toml")
+	viper.SetEnvPrefix("fermentord")
+	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "__"))
 }
 
 func LoadConfiguration() Configuration {
@@ -48,6 +50,8 @@ func LoadConfiguration() Configuration {
 		log.Printf("Error loading configuration: %v", err)
 	}
 
+	viper.AutomaticEnv()
+
 	config := Configuration{}
 	if err := viper.Unmarshal(&config); err != nil {
 		sentry.CaptureException(err)