Merge ~ines-almeida/launchpad-layers:update-git-domain-config into launchpad-layers:main

[Ines Almeida]

launchpad-base: update git domain configuration values to use default value if not set

`domain_git` is generally used to determine if an environment has git code hosting enabled or not.
But in cases where we don't want git hosting to be enabled, we still want the domain values to build and display URLs.
Adding a default placeholder value will enable us to display these placeholder URLs.

This replaces: https://code.launchpad.net/~ines-almeida/launchpad-mojo-specs/+git/launchpad-mojo-specs/+merge/461985

[Guruprasad (lgp171188)]

LGTM 👍 Thanks!

review: Approve

diff --git a/launchpad-base/templates/launchpad-base-lazr.conf b/launchpad-base/templates/launchpad-base-lazr.conf
index a73f081..be77d35 100644
--- a/launchpad-base/templates/launchpad-base-lazr.conf
+++ b/launchpad-base/templates/launchpad-base-lazr.conf
@@ -34,11 +34,14 @@ lp_url_hosts: {{ bzr_lp_url_hosts }}
 secure_codebrowse_root: https://{{ domain_bzr }}/
 supermirror_root: http://{{ domain_bzr }}/
 {%- endif %}
+{#- If `domain_git` is not set, use a placeholder default value. #}
+{#- These domain config values are used to build URLs within Launchpad. #}
+{% set domain_git_or_default = domain_git or "git.not.enabled" %}
+internal_git_api_endpoint: http://{{ domain_git_or_default }}:19417/
+git_anon_root: git://{{ domain_git_or_default }}/
+git_browse_root: https://{{ domain_git_or_default }}/
+git_ssh_root: git+ssh://{{ domain_git_or_default }}/
 {%- if domain_git %}
-internal_git_api_endpoint: http://{{ domain_git }}:19417/
-git_anon_root: git://{{ domain_git }}/
-git_browse_root: https://{{ domain_git }}/
-git_ssh_root: git+ssh://{{ domain_git }}/
 {{- opt("loose_objects_threshold", git_loose_objects_threshold) }}
 {{- opt("packs_threshold", git_packs_threshold) }}
 {%- endif %}