split playbook into roles

roles/docker/tasks/main.yml

@@ -0,0 +1,30 @@
+- name: Install Docker prerequisites
+  apt:
+    pkg:
+      - ca-certificates
+      - curl
+      - gnupg
+      - lsb-release
+      - python3-pip
+    state: latest
+    update_cache: true
+- name: Add Docker APT key
+  apt_key:
+    url: https://download.docker.com/linux/ubuntu/gpg
+- name: Add Docker repository
+  apt_repository:
+    repo: "deb https://download.docker.com/linux/ubuntu {{ ansible_distribution_release }} stable"
+- name: Install Docker packages
+  apt:
+    pkg:
+      - docker-ce
+      - docker-ce-cli
+      - containerd.io
+      - docker-compose-plugin
+    state: latest
+    update_cache: true
+- name: Install Docker modules for Python
+  pip:
+    name:
+      - docker
+      - docker-compose