refactor into separate download + install tasks an make use of the download cache directory

Author: tknerr

roles/docker/tasks/main.yml

@@ -1,19 +1,18 @@
 ---
 
-- name: Install Containerd 1.4.6
-  apt:
-    deb: https://download.docker.com/linux/ubuntu/dists/focal/pool/stable/amd64/containerd.io_1.4.6-1_amd64.deb
-    state: present
-
-- name: Install Docker CE CLI 20.10.7
-  apt:
-    deb: https://download.docker.com/linux/ubuntu/dists/focal/pool/stable/amd64/docker-ce-cli_20.10.7~3-0~ubuntu-focal_amd64.deb
-    state: present
+- name: Download Docker CE .deb Packages
+  get_url:
+    url: https://download.docker.com/linux/ubuntu/dists/focal/pool/stable/amd64/{{ item.deb_file }}
+    checksum: "sha256:{{ item.sha256sum }}"
+    dest: "{{ download_cache_dir }}/{{ item.deb_file }}"
+    force: no
+  with_items: "{{ docker_deb_packages }}"
 
-- name: Install Docker CE Engine 20.10.7
+- name: Install Docker CE .deb Packages
   apt:
-    deb: https://download.docker.com/linux/ubuntu/dists/focal/pool/stable/amd64/docker-ce_20.10.7~3-0~ubuntu-focal_amd64.deb
+    deb: "{{ download_cache_dir }}/{{ item.deb_file }}"
     state: present
+  with_items: "{{ docker_deb_packages }}"
 
 - name: Add VM user to 'docker' group
   user:

roles/docker/vars/main.yml

@@ -0,0 +1,9 @@
+---
+
+docker_deb_packages:
+- deb_file: containerd.io_1.4.6-1_amd64.deb
+  sha256sum: c11e644e8fcb6fe92ff2be9a9b730b9baee0f467ac7db1d8597437ff232261c8
+- deb_file: docker-ce-cli_20.10.7~3-0~ubuntu-focal_amd64.deb
+  sha256sum: 1c3f6b4804523c77a9ef89d7ee894c2749c2acb2e8de53d3d49a02fc2c9faf51
+- deb_file: docker-ce_20.10.7~3-0~ubuntu-focal_amd64.deb
+  sha256sum: e0a81fcee2e9b97ba8c6c061772e220ff02975a2da9a6c155b1aa9743dc9dfbc