Post to variable slack channels

[newellista]

If you define the SiteSetting.slack_channel to include {category},
the plugin will substitute the Post category name.

For example:

If you have defined:

SiteSetting.slack_channel = "#discourse-{category}"

and you create a new Post in with a Category of "Servers", the
notification will get posted to the #discourse-servers channel.

[bernd]

@newellista Would #7 fit for your use case as well?

[newellista]

@bernd #7 looks like it would cover our use case. I'm fine with either solution.