refactor: replace docker stack with k3s/containerd

ansible/roles/k3s/tasks/containerd.yml

@@ -0,0 +1,18 @@
+- name: Add apt key
+  apt_key:
+    url:  https://download.docker.com/linux/debian/gpg
+
+- name: Add docker-ce repository
+  apt_repository:
+    repo: deb [arch={{ arch | default('armhf') }}] https://download.docker.com/linux/debian {{ ansible_distribution_release }} stable
+    state: present
+    filename: 'docker'
+
+
+- meta: flush_handlers
+
+- name: Install containerd.io
+  apt:
+    name:
+      - containerd.io
+    state: present

ansible/roles/k3s/tasks/k3s.yml

@@ -0,0 +1,20 @@
+---
+- name: Download k3s binary
+  get_url:
+    url: "{{ k3s_url}}"
+    dest: "/usr/local/bin/k3s"
+    mode: 0755
+    force: yes
+
+- name: Copy systemd script
+  template:
+    src: k3s.service.j2
+    dest: /etc/systemd/system/k3s.service
+  notify: restart k3s
+
+- name: Ensure k3s service is started
+  systemd:
+    name: k3s
+    enabled: yes
+    daemon_reload: yes
+    state: started

ansible/roles/k3s/tasks/main.yaml

@@ -0,0 +1,3 @@
+---
+- include_tasks: containerd.yml
+- include_tasks: k3s.yml