Add monica deployment

Added basic monica docker deployment.

A key which is required for monica is automatically generated on
deployment.
Optionally, geolocation and weather api can be enabled.
Mail-sending functionality is disabled by default but can be enabled
with any compatible smtp server set up.

roles/monica/templates/docker-stack.yml.j2

@@ -0,0 +1,70 @@
+version: '3.7'
+
+services:
+  app:
+    image: {{ stack_image }}:{{ monica_version }}
+    networks:
+      - "{{ docker_swarm_public_network_name }}"
+      - backend
+    volumes:
+      - data:/var/www/html/storage
+    environment:
+{% if server_domain is not undefined and not none %}   
+      - APP_ENV=production
+{% else %}
+      - APP_ENV=local
+{% endif %}
+      - APP_KEY={{ monica_app_key }}
+{% if monica_app_disable_signups is sameas true %}
+      - APP_DISABLE_SIGNUP=true
+{% endif %}
+      - DB_HOST=db
+      - DB_DATABASE={{ monica_db_database }}
+      - DB_USERNAME={{ monica_db_username }}
+      - DB_PASSWORD={{ monica_db_password }}
+{% if server_domain is not undefined and not none %}   
+      - "APP_URL={{ (monica_use_https == True) | ternary('https', 'http') }}://{{ (subdomain_alias is not undefined and not none) | ternary(subdomain_alias, stack_name) }}.{{server_domain}}"
+{% if monica_app_geolocation_api_key is not undefined and not none %}
+      - ENABLE_GEOLOCATION=true
+      - LOCATION_IQ_API_KEY={{ monica_app_geolocation_api_key }}
+{% if monica_app_weather_api_key is not undefined and not none %}   
+      - ENABLE_WEATHER=true
+      - DARKSKY_API_KEY={{ monica_app_weather_api_key }}
+{% endif %}
+{% endif %}
+{% if monica_mail_host is not undefined and not none %}   
+      - MAIL_MAILER=smtp
+      - MAIL_HOST={{ monica_mail_host }}
+      - MAIL_PORT={{ monica_mail_port }}
+      - MAIL_ENCRYPTION={{ monica_mail_encryption }}
+      - MAIL_USERNAME={{ monica_mail_username }}
+      - MAIL_PASSWORD={{ monica_mail_password }}
+      - MAIL_FROM_ADDRESS={{ monica_mail_from }}
+      - MAIL_FROM_NAME="{{ monica_mail_from_name }}"
+      - APP_EMAIL_NEW_USERS_NOTIFICATION={{ monica_mail_new_user_notification_address }}
+{% endif %}
+{% else %}
+      - "APP_URL={{ (monica_use_https == True) | ternary('https', 'http') }}://localhost/{{ (subdomain_alias is not undefined and not none) | ternary(subdomain_alias, stack_name) }}/"
+      - APP_FORCE_URL=true
+{% endif %}
+
+  db:
+    image: mariadb:10
+    environment:
+      - MYSQL_ROOT_PASSWORD={{ monica_db_root_password }}
+      - MYSQL_DATABASE={{ monica_db_database }}
+      - MYSQL_USER={{ monica_db_username }}
+      - MYSQL_PASSWORD={{ monica_db_password }}
+    networks:
+      - backend
+    volumes:
+      - db:/var/lib/mysql
+
+volumes:
+  data:
+  db:
+
+networks:
+  "{{ docker_swarm_public_network_name }}":
+    external: true
+  backend: