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/tasks/Ubuntu.yml

@@ -0,0 +1,12 @@
+---
+## install requisites
+- name: Ensure openssl installed
+  ansible.builtin.package:
+    name: "openssl"
+    state: present
+  become: yes
+  tags:
+    - apt
+    - download
+    - packages
+

roles/monica/tasks/main.yml

@@ -0,0 +1,40 @@
+---
+- name: "Select tasks for {{ ansible_distribution }} {{ ansible_distribution_major_version }}"
+  include_tasks: "{{ distribution }}"
+  with_first_found:
+    - "{{ ansible_distribution }}-{{ ansible_distribution_major_version }}.yml"
+    - "{{ ansible_distribution }}.yml"
+    - "{{ ansible_os_family }}.yml"
+  loop_control:
+    loop_var: distribution
+
+- name: Generate key
+  ansible.builtin.shell: echo -n 'base64:'; openssl rand -base64 32
+  register: monica_app_key
+
+- set_fact: 
+    monica_app_key={{ monica_app_key.stdout }}
+
+## install container
+- name: Check upstream status
+  community.docker.docker_container_exec:
+    container: "{{ caddy_container_id }}"
+    command: >
+      curl localhost:2019/id/{{ stack_name }}_upstream/
+  register: result
+  changed_when: (result.stdout | from_json) != (lookup('template', 'upstream.json.j2') | from_yaml)
+  become: yes
+  notify: "update monica upstream"
+
+- name: Deploy to swarm
+  community.general.docker_stack:
+    name: "{{ stack_name }}"
+    state: present
+    prune: yes
+    compose:
+      - "{{ stack_compose }}"
+  become: yes
+  tags:
+    - docker-swarm
+  notify: "update monica upstream"
+