Add support for tcib_extra_config for master branch only

OSBS tool used in downstream to build wallaby container
doesnot support taking ARGS from FROM label in Dockerfile[1].
It is blocking the container build job[2].
So enabling tcib_extra_config for master only unblocks the line.

Links:
[1]. containerbuildsystem/dockerfile-parse#118
[2]. https://bugzilla.redhat.com/show_bug.cgi?id=2128230

Change-Id: I4b68432080e6c87d60e281acd8dae994e85e2e01

Author: bshewale

roles/build-containers/templates/tripleo-build.sh.j2

@@ -92,7 +92,7 @@ openstack tripleo container image build \
      --tcib-extra tcib_release={{ ansible_distribution_major_version }} \
      --tcib-extra tcib_python_version={{ (ansible_distribution_major_version is version('9', '<')) | ternary ('3.6', '3.9') }} \
 {%   endif %}
-{% if (tcib_extra_config is defined) and (release|default(branch) not  in ["train"]) %}
+{% if (tcib_extra_config is defined) and (release|default(branch) not  in ["train", "wallaby"]) %}
      --extra-config {{ workspace }}/extra_config.yaml \
 {% endif %}
      --debug