Create Slack channels for incidents
Cross-link with GitLab issue.
Related: https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/11271, https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/11298
For auto-archiving the slack channels, which this MR doesn't address, I'd suggest writing a woodhouse subcommand that we run as a CI cronjob that uses Slack's conversations APIs to look for channels that were created by woodhouse (optional), match the project-name-\d+
regex, and are over a certain age, and archive them. We can do that in a follow-on MR.
Edited by Craig Furman