Change error to warning for Pulumi testing.

ts/pulumi/bazel_rce/index.ts

@@ -11,6 +11,7 @@ import * as awsx from '@pulumi/awsx';
 import * as GitHub from '@pulumi/github';
 import * as Pulumi from '@pulumi/pulumi';
 import * as random from '@pulumi/random';
+import { Command } from 'ts/github/actions';
 import * as Cert from 'ts/pulumi/lib/certificate';
 
 export interface Args {
@@ -380,7 +381,9 @@ export class BazelRemoteCache extends Pulumi.ComponentResource {
 
 		void self.then(self => {
 			if (!self.username)
-				throw `Unable to get own user details. GITHUB_TOKEN may not be configured.`;
+				Command('warning')({})(
+					'Unable to get GitHub username. Perhaps GITHUB_TOKEN needs to be specified?'
+				);
 		});
 
 		new GitHub.ActionsSecret(