ansible: Deploy ARA

[ARA Records Ansible][0] is a results storage system for Ansible.  It
provides a convenient UI for tracking Ansible playbooks and tasks.  The
data are populated by an Ansible callback plugin.

ARA is a fairly simple Python+Django application.  It needs a database
to store Ansible results, so we've connected it to the main PostgreSQL
database and configured it to connect and authenticate using mTLS.

Rather than mess with managing and distributing a static password for
ARA clients, I've configured Autheliad to allow anonymous access to
post data to the ARA API from within the private network or the
Kubernetes cluster.  Access to the web UI does require authentication.

[0]: https://ara.recordsansible.org/

ansible/ara/settings.toml

@@ -0,0 +1,38 @@
+[default]
+ALLOWED_HOSTS = [
+    'ara.ansible.pyrocufflink.blue',
+]
+LOG_LEVEL = 'INFO'
+TIME_ZONE = 'UTC'
+
+EXTERNAL_AUTH = true
+READ_LOGIN_REQUIRED = false
+WRITE_LOGIN_REQUIRED = false
+
+DATABASE_ENGINE = 'django.db.backends.postgresql'
+DATABASE_HOST = 'postgresql.pyrocufflink.blue'
+DATABASE_NAME = 'ara'
+DATABASE_USER = 'ara'
+
+[default.DATABASE_OPTIONS]
+sslmode = 'verify-full'
+sslcert = '/run/secrets/ara/postgresql/tls.crt'
+sslkey = '/run/secrets/ara/postgresql/tls.key'
+sslrootcert = '/run/dch-ca/dch-root-ca.crt'
+
+[default.LOGGING]
+version = 1
+disable_existing_loggers = false
+
+[default.LOGGING.formatters.normal]
+format = '%(levelname)s %(name)s: %(message)s'
+
+[default.LOGGING.handlers.console]
+class = 'logging.StreamHandler'
+formatter = 'normal'
+level = 'INFO'
+
+[default.LOGGING.loggers.ara]
+handlers = ['console']
+level = 'INFO'
+propagate = false