> This is the open source management service account used for performing key GitHub operations on behalf of Microsoft employees and users.
Combined with the nonsense README change, this looks like a bot mis-use accident.
Edit: to clarify, in no way am I saying that this is a "honest mistake" which does not deserve scrutiny.
Essentially GitHub's webhook is configured to hit the Lambda function, which authenticates the request and adds the data to an SQS queue. The internal relay service watches that queue and passes requests to the private Jenkins server.
The architecture is similar to this[1] project, but since the public-facing piece runs on Lambda, it costs almost nothing to run.
[1] https://github.com/osbuild/webhook-relay
Takes the complexity of having to use a queue out of the equation, though at the expense of potentially lost webhook calls.