Make no-reply email address required when email is enabled

- Added helpful hint in prompt suggesting to use SMTP username
- Added validation to ensure no-reply email is not empty when email is enabled
- Applied gofmt formatting improvements

Co-authored-by: oschwartz10612 <4999704+oschwartz10612@users.noreply.github.com>

install/main.go

@@ -54,8 +54,8 @@ type Config struct {
 type SupportedContainer string
 
 const (
-	Docker SupportedContainer = "docker"
-	Podman SupportedContainer = "podman"
+	Docker    SupportedContainer = "docker"
+	Podman    SupportedContainer = "podman"
 	Undefined SupportedContainer = "undefined"
 )
 
@@ -209,8 +209,8 @@ func main() {
 
 					parsedURL, err := url.Parse(appConfig.DashboardURL)
 					if err != nil {
-                        fmt.Printf("Error parsing URL: %v\n", err)
-                        return
+						fmt.Printf("Error parsing URL: %v\n", err)
+						return
 					}
 
 					config.DashboardDomain = parsedURL.Hostname()
@@ -359,7 +359,7 @@ func collectUserInput(reader *bufio.Reader) Config {
 		config.EmailSMTPPort = readInt(reader, "Enter SMTP port (default 587)", 587)
 		config.EmailSMTPUser = readString(reader, "Enter SMTP username", "")
 		config.EmailSMTPPass = readString(reader, "Enter SMTP password", "") // Should this be readPassword?
-		config.EmailNoReply = readString(reader, "Enter no-reply email address", "")
+		config.EmailNoReply = readString(reader, "Enter no-reply email address (often the same as SMTP username)", "")
 	}
 
 	// Validate required fields
@@ -371,6 +371,10 @@ func collectUserInput(reader *bufio.Reader) Config {
 		fmt.Println("Error: Let's Encrypt email is required")
 		os.Exit(1)
 	}
+	if config.EnableEmail && config.EmailNoReply == "" {
+		fmt.Println("Error: No-reply email address is required when email is enabled")
+		os.Exit(1)
+	}
 
 	// Advanced configuration