ipa: Use openstack_branch instead of master

ironic-python-agent-builder has stable branches since Wallaby -
let's use them.

Also as per ipab docs [1] - the env vars for overriding ipa repo
are:
- DIB_REPOREF_ironic_python_agent
- DIB_REPOLOCATION_ironic_python_agent

[1]: https://docs.openstack.org/ironic-python-agent-builder/latest/admin/dib.html#building

Story: 2009755
Task: 44224

Change-Id: I025532156de831a0e7d025d61601a38202de10ff

ansible/group_vars/all/ipa

@@ -16,8 +16,8 @@ ipa_build_source_version: "{{ openstack_branch }}"
 # URL of IPA builder source repository.
 ipa_builder_source_url: "https://opendev.org/openstack/ironic-python-agent-builder"
 
-# Version of IPA builder source repository. Default is master.
-ipa_builder_source_version: master
+# Version of IPA builder source repository. Default is {{ openstack_branch }}.
+ipa_builder_source_version: "{{ openstack_branch }}"
 
 # List of default Diskimage Builder (DIB) elements to use when building IPA
 # images. Default is ["centos", "enable-serial-console",
@@ -45,8 +45,8 @@ ipa_build_dib_env_default:
   # TODO(mgoddard): Use {{ os_release }} here when we use os_distribution
   # above.
   DIB_RELEASE: "8-stream"
-  DIB_REPOLOCATION_ironic_agent: "{{ ipa_build_source_url }}"
-  DIB_REPOREF_ironic_agent: "{{ ipa_build_source_version }}"
+  DIB_REPOLOCATION_ironic_python_agent: "{{ ipa_build_source_url }}"
+  DIB_REPOREF_ironic_python_agent: "{{ ipa_build_source_version }}"
 
 # Dictionary of additional environment variables to provide to Diskimage
 # Builder (DIB) during IPA image build.

etc/kayobe/ipa.yml

@@ -16,7 +16,7 @@
 # URL of IPA builder source repository.
 #ipa_builder_source_url:
 
-# Version of IPA builder source repository. Default is master.
+# Version of IPA builder source repository. Default is {{ openstack_branch }}.
 #ipa_builder_source_version:
 
 # List of default Diskimage Builder (DIB) elements to use when building IPA

releasenotes/notes/ipa-branch-b29c377c531013a8.yaml

+---
+fixes:
+  - |
+    Fixes an issue with IPA image builds which used the ``master``
+    branch of ``ironic-python-agent``, even on stable releases
+    of Kayobe, or when explicitly setting ``ipa_build_source_version``.