Add udev as a service: (#276)

## Description

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This allows devices to be updated when there are changes during the
runtime of HookOS.

## Why is this needed

<!--- Link to issue you have raised -->

Fixes: #

## How Has This Been Tested?
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<!--- Include details of your testing environment, and the tests you ran
to -->
<!--- see how your change affects other areas of the code, etc. -->


## How are existing users impacted? What migration steps/scripts do we
need?

<!--- Fixes a bug, unblocks installation, removes a component of the
stack etc -->
<!--- Requires a DB migration script, etc. -->


## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

Author: jacobweinstock

linuxkit-templates/hook.template.yaml

@@ -79,6 +79,20 @@ services:
   - name: ntpd
     image: linuxkit/openntpd:v1.0.0
 
+  - name: udev # as a service; so system reacts to changes in devices
+    image: "${HOOK_CONTAINER_UDEV_IMAGE}"
+    command: [ "/lib/systemd/systemd-udevd", "--debug" ]
+    capabilities: [ all ]
+    binds: [ /dev:/dev, /sys:/sys, /lib/modules:/lib/modules ]
+    rootfsPropagation: shared
+    net: host
+    pid: host
+    devices:
+      - path: all
+        type: b
+      - path: all
+        type: c
+
   - name: acpi
     image: "${HOOK_CONTAINER_ACPID_IMAGE}"
     capabilities: