Add notes about release rpms and extra tags

docs/koji/bootstrapping.md

@@ -333,6 +333,11 @@ package groups in the `centos*-cern` you created [previously](#create-base-for-u
 [This package](https://gitlab.cern.ch/linuxsupport/rpms/cern-ca-certs) is also
 required by other stuff, so it's best to get it in early to avoid surprises.
 
+### `*-release`
+
+Where appropriate, you probably also want to build a `*-release` RPM to
+configure a machine to point to your new mirrors.
+
 
 ## Create tag for openafs
 
@@ -419,5 +424,11 @@ Adding 1 packages to tag cs8-image-8x
 Adding 1 packages to tag cs8-image-8x
 ```
 
+## Start creating new tags
+
+Now you can start creating other tags as necessary. It's probably a good idea
+to start with `myrpm` (for testing `rpmci`), `linuxsupport` (for our packages)
+and probably `config` (for Configuration Management stuff).
+
 ## build docker image
 ## build cloud image