[refactor] Off with git_current_branch variable

Use instead
- `awx_playbook_branch` for `awx-instance` role,
- `images_build_branch` for `wordpress-openshift-namespace` role.

ansible/roles/awx-instance/tasks/main.yml

@@ -97,13 +97,8 @@
             prj.organization = org
             prj.scm_type = "git"
             prj.scm_url = "{{ awx_project_github_url }}"
-            prj.scm_branch = "{{ _awx_playbook_branch }}"
+            prj.scm_branch = "{{ awx_playbook_branch }}"
             prj.scm_update_on_launch = True
-  vars:
-    _awx_playbook_branch: >-
-      {{ awx_playbook_branch | default(
-      "master" if awx_is_production else git_current_branch)
-      }}
 
 - import_tasks: container-group.yml
   tags: awx

ansible/roles/wordpress-openshift-namespace/defaults/main.yml

@@ -1,2 +1,3 @@
 ---
-# defaults file for wordpress-openshift-namespace
+# defaults file for wordpress-openshift-namespace role
+images_build_branch: master

ansible/roles/wordpress-openshift-namespace/tasks/images.yml

@@ -24,7 +24,7 @@
     git:
         repository: "{{ wp_ops_git_uri }}"
         path: "{{ item.git_path }}"
-        ref: "{{ git_current_branch }}"
+        ref: "{{ images_build_branch }}"
     strategy: "{{ item.strategy | default({}) }}"
   with_items:
     - name: "{{ wp_base_image_name }}"
@@ -42,9 +42,7 @@
                 --s3-bucket-name={{  build.s3_assets.bucket_name }}
                 --s3-key-id={{       build.s3_assets.key_id }}
                 --s3-secret={{       build.s3_assets.secret | eyaml(eyaml_keys) }}
-                {%if images_build_branch is defined %}
                 --manifest-url=https://raw.githubusercontent.com/epfl-si/wp-ops/{{ images_build_branch }}/ansible/roles/wordpress-instance/tasks/plugins.yml
-                {%endif%}
     - name: "{{ httpd_image_name }}"
       git_path: docker/httpd
       from: "{{ wp_base_image_name }}"

ansible/wpsible

@@ -21,12 +21,6 @@ cd "$(dirname "$0")"; cd "$(/bin/pwd)"
 playbook_flags="-e play_update=yes -e play_backup=yes -e play_create_or_restore=yes"
 ansible_flags="-e @roles/wordpress-instance/vars/main.yml"
 
-git_current_branch="$(git rev-parse --abbrev-ref HEAD 2>/dev/null)"
-case "$git_current_branch" in
-    "") : ;;
-    *) playbook_flags="$playbook_flags -e git_current_branch=$git_current_branch" ;;
-esac
-
 warn () {
     if [ -n "$1" ]; then
         echo "$@" >&2