title: AWS CodePipeline: source action has insufficient permissions for CodeStar connection
body: <p>I'm setting up a CodePipeline, and I created an action to fetch the source from GitHub.</p>
  <p>This requires to set up a connection, which I did, and things look fine also on GitHub's side.</p>
  <p>However, if I release a change to the pipeline, I see the following error at the source stage:</p>
  <pre><code>Insufficient permissions
  Unable to use Connection: arn:aws:codestar-connections:us-east-1:REDACTED:connection/REDACTED. The provided role does not have sufficient permissions.
  </code></pre>
  <p>I added full CodeStar access to the pipeline's service role (which I found in the pipeline settings) and looks like this:</p>
  <pre><code>arn:aws:iam::REDACTED:role/service-role/AWSCodePipelineServiceRole-us-east-1-REDACTED
  </code></pre>
  <p>Does anybody have any idea of what might be missing? Thanks!</p>