fix(cli-lib): cannot bootstrap specific environment

packages/@aws-cdk/cli-lib-alpha/lib/cli.ts

@@ -172,7 +172,9 @@ export class AwsCdkCli implements IAwsCdkCli {
    * cdk bootstrap
    */
   public async bootstrap(options: BootstrapOptions = {}) {
+    const envs = options.environments ?? [];
     const bootstrapCommandArgs: string[] = [
+      ...envs,
       ...renderBooleanArg('force', options.force),
       ...renderBooleanArg('show-template', options.showTemplate),
       ...renderBooleanArg('terminationProtection', options.terminationProtection),

packages/@aws-cdk/cli-lib-alpha/lib/commands/bootstrap.ts

@@ -4,6 +4,14 @@ import { SharedOptions } from './common';
  * Options to use with cdk bootstrap
  */
 export interface BootstrapOptions extends SharedOptions {
+  /**
+   * The target AWS environments to deploy the bootstrap stack to.
+   * Uses the following format: `aws://<account-id>/<region>`
+   *
+   * @example "aws://123456789012/us-east-1"
+   * @default - Bootstrap all environments referenced in the CDK app or determine an environment from local configuration.
+   */
+  readonly environments?: string[];
 
   /**
    * The name of the CDK toolkit stack to create

packages/@aws-cdk/cli-lib-alpha/test/commands.test.ts

@@ -369,4 +369,16 @@ describe('list', () => {
     );
   });
 
+  test('bootstrap specific environment', async () => {
+    // WHEN
+    await cdk.bootstrap({
+      environments: ['aws://123456789012/us-east-1'],
+    });
+
+    // THEN
+    expect(jest.mocked(cli.exec)).toHaveBeenCalledWith(
+      ['bootstrap', 'aws://123456789012/us-east-1', '--all'],
+      expect.anything(),
+    );
+  });
 });