fix(coderd): show correct deletion time in dormancy notification (#26488)

The dormancy notification's "will be automatically deleted in X"
sentence rendered the dormancy threshold instead of the auto-delete
duration. A 30-day threshold rendered as "4 weeks" even when auto-delete
was 90 days; a 60-day threshold rendered as "1 month" with a 7-day
auto-delete. Render the countdown from the auto-delete setting, and skip
the deletion sentence entirely when auto-delete is disabled so the
notification no longer promises a deletion that will never happen.

coderd/workspaces.go

@@ -1448,29 +1448,24 @@ func (api *API) putWorkspaceDormant(rw http.ResponseWriter, r *http.Request) {
 			)
 		}
 
-		tmpl, tmplErr := api.Database.GetTemplateByID(ctx, newWorkspace.TemplateID)
-		if tmplErr != nil {
-			api.Logger.Warn(
-				ctx,
-				"failed to fetch the template of the workspace marked as dormant",
-				slog.Error(err),
-				slog.F("workspace_id", newWorkspace.ID),
-				slog.F("template_id", newWorkspace.TemplateID),
-			)
-		}
-
-		if initiatorErr == nil && tmplErr == nil {
-			dormantTime := dbtime.Time(now).Add(time.Duration(tmpl.TimeTilDormant))
+		if initiatorErr == nil {
+			labels := map[string]string{
+				"name":   newWorkspace.Name,
+				"reason": "a " + initiator.Username + " request",
+			}
+			// DeletingAt is set by the UPDATE only when the template's
+			// time_til_dormant_autodelete is non-zero, so skip the label when
+			// auto-delete is disabled so the body omits the deletion
+			// timeline.
+			if newWorkspace.DeletingAt.Valid {
+				labels["timeTilDelete"] = humanize.Time(newWorkspace.DeletingAt.Time)
+			}
 			_, err = api.NotificationsEnqueuer.Enqueue(
 				// nolint:gocritic // Need notifier actor to enqueue notifications
 				dbauthz.AsNotifier(ctx),
 				newWorkspace.OwnerID,
 				notifications.TemplateWorkspaceDormant,
-				map[string]string{
-					"name":           newWorkspace.Name,
-					"reason":         "a " + initiator.Username + " request",
-					"timeTilDormant": humanize.Time(dormantTime),
-				},
+				labels,
 				"api",
 				newWorkspace.ID,
 				newWorkspace.OwnerID,