r/frigate: Add udev rules for coral tpu

Since the _frigate.service_ unit depends on _dev-apex_0.device_,
`/dev/apex_0` needs to have the `systemd` "tag" on its udev device info.
Without this tag, systemd will not "see" the device and thus will not
mark the `.device` unit as active.

roles/frigate/files/apex.rules

@@ -0,0 +1,2 @@
+# vim: set ft=udevrules :
+SUBSYSTEM=="apex", MODE="0660", GROUP="apex", TAG+="systemd"

roles/frigate/handlers/main.yml

@@ -6,3 +6,8 @@
   service:
     name: frigate
     state: restarted
+
+- name: reload udev
+  command: udevadm control --reload
+- name: trigger udev
+  command: udevadm trigger

roles/frigate/tasks/main.yml

@@ -98,6 +98,19 @@
   tags:
   - config
 
+- name: ensure udev rules are in place for google coral tpu
+  copy:
+    src: apex.rules
+    dest: /etc/udev/rules.d/65-apex.rules
+    owner: root
+    group: root
+    mode: u=rw,go=r
+  notify:
+  - reload udev
+  - trigger udev
+  tags:
+  - udev
+
 - name: flush handlers
   meta: flush_handlers
 - name: ensure frigate is running