common: inherit from tier-x on c9s/el9.6+

Inherit from FCOS inheriting from tier-x starting from c9s and el9.6+.

The only major delta here for RHCOS is that FCOS and tier-x turn off
weak deps, but RHCOS historically has enabled them. Would be nice to
also turn them off in RHCOS as well but let's do that move separately
from this one since it additionally requires careful analysis e.g. of
what packages get dropped.

common.yaml

@@ -7,7 +7,6 @@ include:
   - fedora-coreos-config/manifests/networking-tools.yaml
   - fedora-coreos-config/manifests/user-experience.yaml
   - fedora-coreos-config/manifests/shared-workarounds.yaml
-  - fedora-coreos-config/manifests/bootupd.yaml
   # RHCOS owned packages
   - packages-rhcos.yaml
 
@@ -47,10 +46,17 @@ conditional-include:
     include: fedora-coreos-config/manifests/shared-el9.yaml
   - if: osversion == "rhel-9.6"
     include: fedora-coreos-config/manifests/shared-el9.yaml
+  - if: inherit_tier_x == true
+    include: fedora-coreos-config/manifests/tier-x.yaml
+  - if: inherit_tier_x == false
+    include: fedora-coreos-config/manifests/bootupd.yaml
 
 
 documentation: false
 
+# historical default
+recommends: true
+
 postprocess:
   # Mark the OS as of the CoreOS variant.
   # XXX: should be part of a centos/redhat-release subpackage instead

manifest-c9s.yaml

@@ -7,6 +7,7 @@ metadata:
 
 variables:
   osversion: "c9s"
+  inherit_tier_x: true
 
 # Include manifests common to all RHEL and CentOS Stream versions
 include:

manifest-rhel-9.4.yaml

@@ -7,6 +7,7 @@ metadata:
 
 variables:
   osversion: "rhel-9.4"
+  inherit_tier_x: false
 
 # Include manifests common to all RHEL and CentOS Stream versions
 include:

manifest-rhel-9.6.yaml

@@ -7,6 +7,7 @@ metadata:
 
 variables:
   osversion: "rhel-9.6"
+  inherit_tier_x: true
 
 # Include manifests common to all RHEL and CentOS Stream versions
 include: