add readme

Signed-off-by: Costin Gamenț <[email protected]>

Author: kwozyman

training/iso-builder/README.md

@@ -0,0 +1,52 @@
+Installation iso builder
+---
+
+This directory provides an easy way to build installation `iso` images with a container and a kickstart
+embedded.
+
+# Makefile targets
+
+| Target      | Description                                             |
+|-------------|---------------------------------------------------------|
+| image       | Build the container                                     |
+| iso         | Create bootable installation iso                        |
+
+# Makefile variables
+
+| Variable                  | Description                                     | Default                                     |
+|---------------------------|-------------------------------------------------|---------------------------------------------|
+| FROM                      | Overrides the base image for the Containerfile  | `quay.io/centos/centos:stream9`             |
+| REGISTRY                  | Container Registry for storing container images | `quay.io`                                   |
+| REGISTRY_ORG              | Container Registry organization 	     	      | `ai-lab`                                    |
+| IMAGE_NAME                | Container image name                            | `iso-builder`                               |
+| IMAGE_TAG                 | Container image tag                             | `latest`                                    |
+| CONTAINER_TOOL            | Container tool used for build                   | `podman`                                    |
+| CONTAINER_TOOL_EXTRA_ARGS | Container tool extra arguments                  | ` `                                         |
+| EMBED_IMAGE               | The container image to embed in the iso         | *Required*                                  |
+| ORIGINAL_ISO              | Path to the base installation iso               | *Required*                                  |
+| SSHKEY                    | The SSH public key for the root account         | *Required*                                  |
+| OUTPUT_DIR                | Path where to store the new installation iso    | `./iso`                                     |
+
+# How to build the container image
+
+The first step is simple, the `iso-builder` container image needs to be build:
+
+```
+make image
+```
+
+This is based on CentOS Stream by default, for Red Hat Enterprise Linux you would use the `FROM` variable:
+
+```
+make image FROM=registry.access.redhat.com/ubi9/ubi:latest
+```
+
+# How to build the iso image
+
+First, you need to have a recent Anaconda based installation iso. The latest CentOS Stream 9, Fedora 40 or Red Hat Enterprise Linux 9
+installation isos will work.
+
+```
+make iso EMBED_IMAGE=<container-image> ORIGINAL_ISO=/path/to/original.iso SSHKEY="my public ssh-key"
+```
+