Add support for GitHub Actions on Jira

As mentioned previously maintained on https://github.com/atlassian/gajira, it would be great if the GitHub for Jira app was able to also integrate with GitHub actions to:

• Automatically transition an issue to done when a pull request whose name contains the issue key is merged
• Automatically create a new Jira issue when a GitHub issue is created
• Automatically add a comment to a Jira issue when a commit message contains the issue key
• Automatically create a Jira issue for each // TODO: in code