Store JWT key in config file

- During config file creation, the generated JWT key will be stored.
- Added an option to disable this behavior.

internal/jwtauth/key.go

@@ -27,7 +27,7 @@ func getKeyVariableName() string {
 	return "PLM_JWT_KEY"
 }
 
-func InitKey(jwtkey string) error {
+func InitKey(jwtkey string) (string, error) {
 	var err error
 	keyName := getKeyVariableName()
 	//ignore config value, look in env first
@@ -40,7 +40,7 @@ func InitKey(jwtkey string) error {
 		}
 		os.Setenv(keyName, key)
 	}
-	return err
+	return key, err
 }
 
 func GetJwtKey() ([]byte, error) {