Add docker role for making sure Docker is installed

Add a docker role for making sure Docker is installed from the Docker
repositories.
Take the role from the ccchh-ansible repo, provide attribution in the
README and add the relevant license in a new licenses directory.
Modify the role by removing the distribution check and adjusting the
task names to be in line with other task names in this repo.

playbooks/roles/docker/tasks/main/02_docker_install.yaml

@@ -0,0 +1,11 @@
+- name: Ensure Docker Engine and other related packages are installed
+  ansible.builtin.apt:
+    name:
+      - docker-ce
+      - docker-ce-cli
+      - containerd.io
+      - docker-buildx-plugin
+      - docker-compose-plugin
+    state: present
+    update_cache: true
+  become: true