Announce WordCamp deployments in Slack

This is a low priority, but it’d be helpful to announce deployments in SlackSlack Slack is a Collaborative Group Chat Platform The WordPress community has its own Slack Channel at, like we do with The community site where WordPress code is created and shared by the users. This is where you can download the source code for WordPress core, plugins and themes as well as the central location for community conversations and organization.

I added support for it to deployed.php in [dotorg13900], and tested the necessary changes to the deployDeploy Launching code from a local development environment to the production web server, so that it's available to visitors. script in ~/ on my sandbox.

Someone from Systems will need to commit/deploy those to the actual script, though.

Thanks πŸ™‚