feat(app-staging-synthesizer): option to specify staging stack name prefix (#26324)

Optionally specify a prefix for the staging stack name, which will be baked into the stackId and stackName. The default prefix is `StagingStack`. 

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: kaizencc

packages/@aws-cdk/app-staging-synthesizer-alpha/lib/default-staging-stack.ts

@@ -111,6 +111,16 @@ export interface DefaultStagingStackOptions {
    * @default true
    */
   readonly autoDeleteStagingAssets?: boolean;
+
+  /**
+   * Specify a custom prefix to be used as the staging stack name and
+   * construct ID. The prefix will be appended before the appId, which
+   * is required to be part of the stack name and construct ID to
+   * ensure uniqueness.
+   *
+   * @default 'StagingStack'
+   */
+  readonly stagingStackNamePrefix?: string;
 }
 
 /**
@@ -159,12 +169,13 @@ export class DefaultStagingStack extends Stack implements IStagingResources {
           new UsingAppStagingSynthesizer(stack, `UsingAppStagingSynthesizer/${stack.stackName}`);
         }
 
-        const stackId = `StagingStack-${appId}-${context.environmentString}`;
+        const stackPrefix = options.stagingStackNamePrefix ?? 'StagingStack';
+        // Stack name does not need to contain environment because appId is unique inside an env
+        const stackName = `${stackPrefix}-${appId}`;
+        const stackId = `${stackName}-${context.environmentString}`;
         return new DefaultStagingStack(app, stackId, {
           ...options,
-
-          // Does not need to contain environment because stack names are unique inside an env anyway
-          stackName: `StagingStack-${appId}`,
+          stackName,
           env: {
             account: stack.account,
             region: stack.region,

packages/@aws-cdk/app-staging-synthesizer-alpha/test/app-staging-synthesizer.test.ts

@@ -492,6 +492,29 @@ describe(AppStagingSynthesizer, () => {
     Template.fromJSON(getStagingResourceStack(asm).template).resourceCountIs('Custom::S3AutoDeleteObjects', 0);
   });
 
+  test('stack prefix can be customized', () => {
+    // GIVEN
+    const prefix = 'Prefix';
+    app = new App({
+      defaultStackSynthesizer: AppStagingSynthesizer.defaultResources({
+        appId: APP_ID,
+        stagingStackNamePrefix: prefix,
+      }),
+    });
+    stack = new Stack(app, 'Stack', {
+      env: {
+        account: '000000000000',
+        region: 'us-east-1',
+      },
+    });
+
+    // WHEN
+    const asm = app.synth();
+
+    // THEN
+    expect(getStagingResourceStack(asm, prefix).template).toBeDefined();
+  });
+
   describe('environment specifics', () => {
     test('throws if App includes env-agnostic and specific env stacks', () => {
       // GIVEN - App with Stack with specific environment
@@ -536,7 +559,7 @@ describe(AppStagingSynthesizer, () => {
   /**
    * Return the staging resource stack that is generated as part of the assembly
    */
-  function getStagingResourceStack(asm: CloudAssembly) {
-    return asm.getStackArtifact(`StagingStack-${APP_ID}-000000000000-us-east-1`);
+  function getStagingResourceStack(asm: CloudAssembly, prefix?: string) {
+    return asm.getStackArtifact(`${prefix ?? 'StagingStack'}-${APP_ID}-000000000000-us-east-1`);
   }
 });