refactor: combine with Ubuntu Provisioning repo

Combine with this repository with https://github.com/opdavies/ubuntu-provisioning
so that everything can be managed in one place, and add a role for each
piece of software.

roles/docker/tasks/main.yaml

@@ -0,0 +1,22 @@
+---
+- name: Install
+  ansible.builtin.package:
+    name:
+      - docker
+      - docker-compose
+    state: latest
+  become: yes
+
+- name: Enable service
+  ansible.builtin.systemd:
+    enabled: yes
+    name: docker
+    state: started
+  become: yes
+
+- name: Add to group
+  ansible.builtin.user:
+    append: yes
+    groups: docker
+    name: "{{ ansible_env['USER'] }}"
+  become: yes