send email on successful password change

src/main/main.go

@@ -197,6 +197,17 @@ func changePasswordHandler(w http.ResponseWriter, r *http.Request) {
 
 	w.WriteHeader(http.StatusOK)
 	w.Write([]byte(`{"success": true}`))
+
+	data := map[string]any{
+		"Username":    userData[sessionData.UserID].DisplayName,
+		"ServiceName": "Astral Tech",
+	}
+
+	email_template, err := email.RenderTemplate("./data/email-templates/changed-password.html", data, nil)
+	if err != nil {
+		logging.Errorf("Failed to load email template: %s", err.Error())
+	}
+	noReplyEmail.SendEmail([]string{userData[sessionData.UserID].Email}, "Password expired", email_template)
 }
 
 func main() {