fix(cdk-diff): install pnpm [CLK-252116]

src/cdk-diff-workflow.ts

@@ -11,6 +11,14 @@ export module cdkDiffWorkflow {
         ? 'pnpm i --frozen-lockfile'
         : 'yarn install --check-files';
 
+    const installPnpm = {
+      name: 'Setup pnpm',
+      uses: 'pnpm/action-setup@v3',
+      with: {
+        version: options.pnpmVersion ?? '9',
+      },
+    }
+
     const defaultWorkflow = {
       name: 'cdk-diff',
       on: {
@@ -54,6 +62,7 @@ export module cdkDiffWorkflow {
                 'node-version': options.nodeVersion ?? parameters.PROJEN_NODE_VERSION,
               },
             },
+            ...(options.packageManager === javascript.NodePackageManager.PNPM? [installPnpm] : []),
             {
               name: 'Install dependencies',
               run: installDeps,
@@ -294,6 +303,12 @@ export module cdkDiffWorkflow {
      * @default - the packageManager in the project
      */
     readonly packageManager?: javascript.NodePackageManager;
+
+    /**
+     * What version of pnpm?
+     * @default - 9 if you are using PNPM
+     */
+    readonly pnpmVersion?: string;
   }
 
   export function getCDKDiffOptions(options?: CDKDiffOptionsConfig) {
@@ -310,6 +325,7 @@ export module cdkDiffWorkflow {
         ...createCdkDiffWorkflow({
           nodeVersion: project.workflowNodeVersion,
           packageManager: project.package.packageManager,
+          pnpmVersion: project.package.pnpmVersion,
           ...options,
         }),
         ...override,

test/cdk-diff-workflow.test.ts

@@ -1,4 +1,4 @@
-import { Testing } from 'projen';
+import { Testing, javascript } from 'projen';
 // import * as Yaml from 'yaml';
 
 import { requiredParams } from './requiredParams';
@@ -58,6 +58,26 @@ describe('addCdkDiffWorkflowYml - cdk diff.yml file added', () => {
     expect(synth['.github/workflows/cdk-diff.yml']).toMatchSnapshot();
   });
 
+  test('pnpm', () => {
+    const project = new clickupCdk.ClickUpCdkTypeScriptApp({
+      ...requiredParams,
+      packageManager: javascript.NodePackageManager.PNPM,
+      pnpmVersion: '9',
+    });
+    cdkDiffWorkflow.addCdkDiffWorkflowYml(project, {
+      envsToDiff: [
+        {
+          name: 'qa',
+          oidcRoleArn: 'arn:aws:iam::123456789012:role/squad-github-actions-oidc-role-name-qa',
+          labelToApplyWhenNoDiffPresent: 'qa-no-changes',
+          stackSearchString: 'Qa',
+        },
+      ],
+    });
+    const synth = Testing.synth(project);
+    expect(synth['.github/workflows/cdk-diff.yml']).toMatchSnapshot();
+  });
+
   test('a single env to diff - single explicit stack given to diff', () => {
     const project = new clickupCdk.ClickUpCdkTypeScriptApp(requiredParams);
     cdkDiffWorkflow.addCdkDiffWorkflowYml(project, {