add: email delivery test; baseURL config

internal/config/config.go

@@ -45,6 +45,7 @@ type TemplateConfig struct {
 
 type Config struct {
 	ConfigFilePath string               `json:"config_file_path" envconfig:"CONFIG_FILE_PATH"`
+	BaseURL        string               `json:"base_url" envconfig:"BASE_URL"`
 	Auth           AuthenticationConfig `json:"auth"`
 	DB             DatabaseConfig       `json:"db"`
 	Templates      TemplateConfig       `json:"templates"`
@@ -52,6 +53,7 @@ type Config struct {
 }
 
 var (
+	BaseURL   string
 	CFGPath   string
 	CFG       Config
 	Auth      AuthenticationConfig
@@ -83,6 +85,7 @@ func LoadConfig() {
 	DB = CFG.DB
 	Templates = CFG.Templates
 	SMTP = CFG.SMTP
+	BaseURL = CFG.BaseURL
 }
 
 // readFile reads the configuration from the specified file path into the provided Config struct.