Add deployment improvements and UI enhancements

- Clone specific commit SHA from webhook instead of just branch HEAD
- Log webhook payload in deployment logs
- Add build/deploy timing to ntfy and Slack notifications
- Implement container rollback on deploy failure
- Remove old container only after successful deployment
- Show relative times in deployment history (hover for full date)
- Update port mappings UI with labeled text inputs
- Add footer with version info, license, and repo link
- Format deploy key comment as upaas_DATE_appname

internal/handlers/auth.go

@@ -11,7 +11,7 @@ func (h *Handlers) HandleLoginGET() http.HandlerFunc {
 	tmpl := templates.GetParsed()
 
 	return func(writer http.ResponseWriter, _ *http.Request) {
-		data := map[string]any{}
+		data := h.addGlobals(map[string]any{})
 
 		err := tmpl.ExecuteTemplate(writer, "login.html", data)
 		if err != nil {
@@ -36,9 +36,9 @@ func (h *Handlers) HandleLoginPOST() http.HandlerFunc {
 		username := request.FormValue("username")
 		password := request.FormValue("password")
 
-		data := map[string]any{
+		data := h.addGlobals(map[string]any{
 			"Username": username,
-		}
+		})
 
 		if username == "" || password == "" {
 			data["Error"] = "Username and password are required"