title: Invoking Lambda in Codepipeline with Input artifacts being a file from Github from the source
body: <p>As part of my AWS codepipeline, I have the first source stage which gets my branch. Inside the branch, I have a file called  <code>hello.txt</code> and a whole bunch of other files which I don't care about.</p>
  <p>Is it possible to utilise and feed into the AWS Lambda Action Provider, the contents of the hello.txt.</p>
  <p>If so, how?</p>
  <p>I defined SourceArtifact define by Source as the input artifact. Now, how can I reference just that one file and it's value with python</p>