fix(observabillity): propagate ctx to every log call and add resource to logging

internal/service/mail.go

@@ -1,6 +1,7 @@
 package service
 
 import (
+	"context"
 	"fmt"
 	"log/slog"
 	"net/smtp"
@@ -9,7 +10,7 @@ import (
 
 type Mail interface {
 	// Sending an email is a fire and forget operation. Thus no error handling
-	SendMail(to string, subject string, message string)
+	SendMail(ctx context.Context, to string, subject string, message string)
 }
 
 type MailImpl struct {
@@ -20,11 +21,11 @@ func NewMail(server *types.Settings) MailImpl {
 	return MailImpl{server: server}
 }
 
-func (m MailImpl) SendMail(to string, subject string, message string) {
-	go m.internalSendMail(to, subject, message)
+func (m MailImpl) SendMail(ctx context.Context, to string, subject string, message string) {
+	go m.internalSendMail(ctx, to, subject, message)
 }
 
-func (m MailImpl) internalSendMail(to string, subject string, message string) {
+func (m MailImpl) internalSendMail(ctx context.Context, to string, subject string, message string) {
 	if m.server.Smtp == nil {
 		return
 	}
@@ -47,9 +48,9 @@ func (m MailImpl) internalSendMail(to string, subject string, message string) {
 		subject,
 		message)
 
-	slog.Info("sending mail", "to", to)
+	slog.InfoContext(ctx, "sending mail", "to", to)
 	err := smtp.SendMail(s.Host+":"+s.Port, auth, s.FromMail, []string{to}, []byte(msg))
 	if err != nil {
-		slog.Error("Error sending mail", "err", err)
+		slog.ErrorContext(ctx, "Error sending mail", "err", err)
 	}
 }