fedora-image-uploader: add ELN toolbox and base container rename

ELN recently adjusted the subvariants it uses for its built images. What
was previously variant "BaseOS" subvariant "BaseOS" is now subvariant
"container-base". Additionally, they wish to publish a toolbox
container, which is created as variant "BaseOS" with subvariant
"container-toolbox".

These are both confusingly close to the existing Fedora subvariants, so
we may want to consider using the (variant, subvariant) tuple in some
manner in the config to make it clearer.

Signed-off-by: Jeremy Cline <jeremycline@linux.microsoft.com>

roles/openshift-apps/cloud-image-uploader/templates/config.toml

@@ -122,13 +122,15 @@ publish_amqp_messages = true
 Container_Toolbox = "fedora-toolbox"
 Container_Minimal_Base = "fedora-minimal"
 Container_Base = "fedora"
-BaseOS = "eln"
 Silverblue = "fedora-silverblue"
 Kinoite = "fedora-kinoite"
 Onyx = "fedora-budgie-atomic"
 Sericea = "fedora-sway-atomic"
 base = "fedora-bootc"
 IoT = "fedora-iot"
+# These two are ELN images
+container-base = "eln"
+container-toolbox = "eln-toolbox"
 
 {% if env == "staging" %}