install docker task

roles/install_docker/tasks/main.yml

@@ -0,0 +1,22 @@
+---
+- name: Add the docker repo key
+  apt_key:
+    url: https://download.docker.com/linux/debian/gpg
+    state: present
+
+- name: Add docker repo
+  apt_repository:
+    repo: deb [arch=amd64] https://download.docker.com/linux/debian buster stable
+    state: present
+
+- name: Install docker
+  apt:
+    update_cache: true
+    name:
+      - docker-ce
+      - docker-ce-cli
+      - containerd.io
+    state: latest
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded