Github checks integration for Jira status

AWS Lambda implementation that handles webhooks from Jira and updates status checks on Github for related PRs.

1. Update configuration in config.py.
2. Deploy using serverless.

Add webhook https://<host>.atlassian.net/plugins/servlet/webhooks, point it to the deployed function.

• Events: None
• Exclude body: No

For each transition that should update the github status

1. Add required transition properties:

   • githubCheckState: pending, success, failure, error (refer to github docs)
   • githubCheckDescription: <state description>

2. Add post function:

   • Add call to the webhook configured above.