Allow for platform specific variables in docker-compose install

This changes the default docker_compose_dir on macos to a writeable location

installer/install.yml

@@ -1,7 +1,6 @@
 ---
 - name: Build and deploy AWX
   hosts: all
-  gather_facts: false
   roles:
     - { role: check_vars }
     - { role: image_build, when: "dockerhub_base is not defined" }

installer/roles/local_docker/defaults/main.yml

@@ -12,4 +12,3 @@ rabbitmq_default_password: "guest"
 postgresql_version: "9.6"
 postgresql_image: "postgres:{{postgresql_version}}"
 
-docker_compose_dir: "/var/lib/awx"

installer/roles/local_docker/tasks/compose.yml

@@ -1,4 +1,13 @@
 ---
+- include_vars: '{{ item }}'
+  with_first_found:
+    - files:
+        - '{{ ansible_distribution }}-{{ ansible_distribution_major_version }}.yml'     # CentOS-7
+        - '{{ ansible_os_family }}-{{ ansible_distribution_major_version }}.yml'        # RedHat-7
+        - '{{ ansible_distribution }}.yml'                                              # CentOS
+        - '{{ ansible_os_family }}.yml'                                                 # RedHat
+        - 'default.yml'
+
 - name: Create {{ docker_compose_dir }} directory
   file:
     path: "{{ docker_compose_dir }}"
@@ -33,7 +42,7 @@
   docker_service:
     project_src: "{{ docker_compose_dir }}"
   register: awx_compose_start
-    
+
 - name: Update CA trust in awx_web container
   command: docker exec awx_web_1 '/usr/bin/update-ca-trust'
   when: awx_compose_config.changed or awx_compose_start.changed

installer/roles/local_docker/vars/Darwin.yml

@@ -0,0 +1 @@
+docker_compose_dir: "/usr/local/var/lib/awx"

installer/roles/local_docker/vars/default.yml

@@ -0,0 +1 @@
+docker_compose_dir: "/var/lib/awx"