feat(workers): implement worker service add/set/remove api tags

internal/server/repository_worker.go

@@ -711,7 +711,8 @@ func (r *Repository) DeleteWorkerTags(ctx context.Context, workerId string, work
 			return errors.Wrap(ctx, err, op, errors.WithMsg("unable to delete worker tags"))
 		}
 		if rowsDeleted != len(deleteTags) {
-			return errors.New(ctx, errors.MultipleRecords, op, fmt.Sprintf("tags deleted %d did not match request for %d", rowsDeleted, len(tags)))
+			return errors.New(ctx, errors.MultipleRecords, op,
+				fmt.Sprintf("unable to delete specified tag: tags deleted %d did not match request for %d", rowsDeleted, len(tags)))
 		}
 		return nil
 	})

internal/server/worker.go

@@ -153,6 +153,15 @@ func (w *Worker) GetConfigTags() map[string][]string {
 	return tags
 }
 
+// GetApiTags returns the api tags which have been set for this worker.
+func (w *Worker) GetApiTags() map[string][]string {
+	tags := make(map[string][]string)
+	for _, t := range w.apiTags {
+		tags[t.Key] = append(tags[t.Key], t.Value)
+	}
+	return tags
+}
+
 // GetLastStatusTime contains the last time the worker has reported to the
 // controller its connection status.  If the worker has never reported to a
 // controller then nil is returned.