Improve the github bot UX

[guymguym]

Currently the bot only comments back with stdout and stderr of executing copilot-ops, see for example - #51 (comment).

We can improve it the elephant salami method:

• The bot should use --write to apply the generate/edit changes to the checked out repo, and then create a git diff output that will be sent as the answer to the issuer.
• The bot should create a PR with a fixed name, e.g copilot-ops-fix-<issuenumber>, so that subsequent requests on the same issue would checkout the same PR, and every request will then push a new commit to this PR.
• Publish the bot action as a github action in the marketplace so that any repo can embed it and use it (bringing its own openai api key).

[RobotSail]

Potentially adapt this for a bot workflow instead of github actions

[guymguym]

https://github.com/operate-first/probot-template
https://github.com/operate-first/probot-extensions

[guymguym]

@RobotSail created a github app on his account. To be transfered to @redhat-et or to its own org.

[guymguym]

closing this one in favor of the bot repo - redhat-et/copilot-ops-bot#2