More details about docker image

docs/koji/bootstrapping.md

@@ -442,5 +442,23 @@ 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 a Docker image
+
+You'll need a docker image for many things, starting with `rpmci`. You've gotten
+away without it so far, but now it's time to build it.
+
+Start with [c8-base](https://gitlab.cern.ch/linuxsupport/c8-base) as a model and
+adapt it as needed. Make sure you have some tests to make sure your built Docker
+image works as you expect.
+
+Once you have a working Docker image, you can create a scheduled pipeline to
+(rebuild it every month)[https://gitlab.cern.ch/linuxsupport/c8-base/-/pipeline_schedules].
+
+## Build a new worker image for rpmci
+
+
+
+
 ## build cloud image
+
+## Build OpenAFS Kernel Modules