Rename the ara role to ara_api and move nginx out to it's own role

Moving nginx out to it's own role allows us to re-use it for ara-web.
Renaming ara to ara_api and namespacing it's variables helps removing
ambiguities and opportunities for clashing names.

Change-Id: Ie1fc53fa25b00bc86aafda708df9866f02ced6fd

roles/ara_api/tasks/database_engine/django.db.backends.sqlite3.yaml

@@ -0,0 +1,30 @@
+---
+#  Copyright (c) 2019 Red Hat, Inc.
+#
+#  This file is part of ARA Records Ansible.
+#
+#  ARA Records Ansible is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  ARA Records Ansible is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with ARA Records Ansible. If not, see <http://www.gnu.org/licenses/>.
+
+- name: Ensure the database directory exists
+  become: "{{ (ansible_user_dir in ara_api_database_name) | ternary(false, true) }}"
+  file:
+    path: "{{ ara_api_database_name | dirname }}"
+    state: directory
+
+- name: Run SQL migrations
+  become: "{{ (ansible_user_dir in ara_api_database_name) | ternary(false, true) }}"
+  environment:
+    ARA_SETTINGS: "{{ ara_api_settings }}"
+    PATH: "{{ path_with_virtualenv | default(omit) }}"
+  command: ara-manage migrate