Feat(roles/docker): Install Docker (currently Debian-only)

diff --git a/playbooks/roles/docker/README.txt b/playbooks/roles/docker/README.txt
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--- /dev/null
+++ b/playbooks/roles/docker/README.txt
@@ -0,0 +1 @@
+Install Docker (currently Debian-only from Debian repository).

diff --git a/playbooks/roles/docker/tasks/main.yml b/playbooks/roles/docker/tasks/main.yml
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+++ b/playbooks/roles/docker/tasks/main.yml
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+- name: Install Docker (Debian)
+  become: true
+  apt:
+    autoclean: yes
+    autoremove: yes
+    cache_valid_time: 3600
+    install_recommends: no
+    name: docker.io
+    state: latest
+    update_cache: yes
+  when: ansible_facts.os_family == 'Debian'