Change Bifrost Python upper-constraints source

Users can override the upper-constraints.txt by setting the source of
openstack-base in kolla-build.conf.

However, bifrost-base Dockerfile so far doesn't pass overridden
upper-constraints file to Bifrost install playbook resulting the
playbook not acknowledging it and just use upstream one.

This change sets the source of Bifrost upper-constraints to use
upper-constraints of openstack-base for consistency among all Kolla
images

With this, change the environment variable UPPER_CONSTRAINTS_FILE is
only affecting kolla-toolbox image.
Therefore, moved UPPER_CONSTRATINS_FILE variable example to the
``kolla_toolbox_pip_conf`` block of kolla-toolbox Dockerfile.

Additionally, updated 'Python packages build options' section of
documentation to represent latest method of changing Python package
related options (including this change).

Change-Id: I0a9c782ca1177ef84e4323cb1e5bfac0fb3f383c

1 files changed, 5 insertions, 1 deletions

diff --git a/docker/kolla-toolbox/Dockerfile.j2 b/docker/kolla-toolbox/Dockerfile.j2
index 7a60674af..29c3ab640 100644
--- a/docker/kolla-toolbox/Dockerfile.j2
+++ b/docker/kolla-toolbox/Dockerfile.j2
@@ -78,9 +78,13 @@ RUN cd /usr/bin && \
     ln -s python3.12 python3
 {% endif %}
 
+{% block kolla_toolbox_pip_conf %}
+ENV UPPER_CONSTRAINTS_FILE=https://releases.openstack.org/constraints/upper/{{ openstack_release }}
+{% endblock %}
+
 {% block kolla_toolbox_upper_constraints %}
 RUN mkdir -p /requirements \
-    && curl -o /requirements/upper-constraints.txt ${UPPER_CONSTRAINTS_FILE:-https://releases.openstack.org/constraints/upper/{{ openstack_release }}} \
+    && curl -o /requirements/upper-constraints.txt $UPPER_CONSTRAINTS_FILE \
     && {{ macros.upper_constraints_remove("openstacksdk") }} \
     && python3 -m venv --system-site-packages {{ venv_path }} \
     && KOLLA_DISTRO_PYTHON_VERSION=$(/usr/bin/python3 -c "import sys; print('{}.{}'.format(sys.version_info.major, sys.version_info.minor))") \