Allow mcapi proxy git sources and python package versions to be overridden

This code is updated to have overrides similar to many other service
roles in openstack-ansible.

Change-Id: I4fc16b27dacd4ab40269cde1371e70255a4e2ced

mcapi_vexxhost/roles/proxy/defaults/main.yml

@@ -0,0 +1,26 @@
+---
+# Copyright 2024, BBC R&D
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+mcapi_vexxhost_proxy_upper_constraints_url: >-
+  {{ requirements_git_url | default('https://releases.openstack.org/constraints/upper/' ~ requirements_git_install_branch | default('master')) }}
+macpi_vexxhost_proxy_git_constraints:
+  - "--constraint {{ mcapi_vexxhost_proxy_upper_constraints_url }}"
+
+mcapi_vexxhost_proxy_install_branch: main
+mcapi_vexxhost_proxy_git_repo: "{{ openstack_github_base_url | default('https://github.com') ~ '/vexxhost/magnum-cluster-api' }}"
+
+mcapi_vexxhost_proxy_pip_packages:
+ - "{{ 'git+' ~ mcapi_vexxhost_proxy_git_repo ~ '@' ~ mcapi_vexxhost_proxy_install_branch ~ '#egg=magnum-cluster-api' }}"
+

mcapi_vexxhost/roles/proxy/tasks/main.yml

@@ -18,17 +18,13 @@
   import_role:
     name: "python_venv_build"
   vars:
-    _upper_constraints_url: "{{ requirements_git_url | default('https://releases.openstack.org/constraints/upper/' ~ requirements_git_install_branch | default('master')) }}"
-    _git_constraints:
-      - "--constraint {{ _upper_constraints_url }}"
     venv_python_executable: "{{ openstack_venv_python_executable | default('python3') }}"
-    venv_build_constraints: "{{ _git_constraints }}"
+    venv_build_constraints: "{{ macpi_vexxhost_proxy_git_constraints }}"
     venv_install_destination_path: "{{ _bin | dirname }}"
-    #venv_install_distro_package_list:
+    venv_install_distro_package_list:
-    #  - haproxy  # this will be there for free on the host in an AIO
+      - haproxy
     venv_pip_install_args: "{{ pip_install_options | default('') }}"
-    venv_pip_packages:
+    venv_pip_packages: "{{ mcapi_vexxhost_proxy_pip_packages }}"
-      - git+https://github.com/vexxhost/magnum-cluster-api@main#egg=magnum-cluster-api
 
 # create user and group
 - name: Create the magnum_cluster_api_proxy system group