message: Add clarifying type annotation
diff: @@ -49,7 +49,7 @@ export class GcpServer extends ShadowboxServer implements server.ManagedServer {
  private apiClient: gcp_api.RestApiClient) {
  super(id);
  // Optimization: start the check for a static IP immediately.
  - const hasStaticIp = this.hasStaticIp();
  + const hasStaticIp: Promise<boolean> = this.hasStaticIp();
  this.instanceReadiness = instanceCreation.then(async () => {
  if (!await hasStaticIp) {
  await this.promoteEphemeralIp();
  