Pull Request Description

TL;DR

This pull request refactors the aws-codepipeline-actions README.md file to use a declared lambdaFunction instead of creating a new one within the CodeCommitSourceAction declaration.

What changed

The CodeCommitSourceAction declaration in the README.md file of aws-codepipeline-actions package was updated. Instead of creating a new LambdaFunction within the target field, it now uses a previously declared lambdaFunction.

-    target: new LambdaFunction(new Function(stack, 'TestFunction', {
-      code: Code.fromInline('foo'),
-      handler: 'bar',
-      runtime: Runtime.NODEJS_LATEST,
-    })),
+    target: lambdaFuntion,

How to test

To test this change, follow the instructions in the README.md file to set up a CodeCommitSourceAction using a lambdaFunction. Ensure that the pipeline works as expected with the lambdaFunction as the target.

Why make this change

This change simplifies the code and makes it easier to understand. It also promotes the use of declared variables, which can be more efficient and easier to manage in larger codebases.