Add override to ensure ZFS starts before docker

Stolen with love from 7dda0bc7cb

ansible/host_vars/intersect.yml

@@ -1,3 +1,5 @@
 expose_ssh: true
 
 traefik_influx_db_dir: /mnt/tank/dbs/influx/traefik
+
+docker_zfs_override: true

ansible/host_vars/walker.yml

@@ -0,0 +1 @@
+docker_zfs_override: true

ansible/roles/docker_cleanup/defaults/main.yml

@@ -0,0 +1 @@
+docker_zfs_override: false

ansible/roles/docker_cleanup/files/zfs-override.conf

@@ -0,0 +1,3 @@
+[Unit]
+Requires=zfs.target
+After=zfs.target

ansible/roles/docker_cleanup/tasks/main.yml

@@ -44,3 +44,7 @@
     dest: "{{ home }}"
     mode: 0755
     directory_mode: 0755
+
+- name: override docker service for zfs dependencies
+  include: zfs-override.yml
+  when: docker_zfs_override

ansible/roles/docker_cleanup/tasks/zfs-override.yml

@@ -0,0 +1,15 @@
+- name: Create dir for docker service ZFS override
+  file:
+    path: /etc/systemd/system/docker.service.d
+    state: directory
+    mode: "0755"
+  become: true
+
+- name: Create override.conf
+  copy:
+    src: files/zfs-override.conf
+    dest: /etc/systemd/system/docker.service.d/zfs-override.conf
+    owner: root
+    group: root
+    mode: "0644"
+  become: true