moby: add a Devices array to the image yml

According to https://github.com/linuxkit/linuxkit/pull/3684#issuecomment-860128095

runc removed the console as a default device, so now it must be specified
explicitly in the OCI config.

See 60e21ec26e

The similar code in moby/moby is here: https://github.com/moby/moby/blob/master/oci/devices_linux.go

This patch allows packages to declare a `devices` array, which can contain `/dev/console` etc.

Signed-off-by: David Scott <dave@recoil.org>

pkg/getty/build.yml

@@ -14,5 +14,26 @@ config:
     - /var/lib/containerd:/var/lib/containerd
     - /dev:/dev
     - /sys:/sys
+  devices:
+    - path: "/dev/console"
+      type: c
+      major: 5
+      minor: 1
+      mode: 0666
+    - path: "/dev/tty0"
+      type: c
+      major: 4
+      minor: 0
+      mode: 0666
+    - path: "/dev/ttyS0"
+      type: c
+      major: 4
+      minor: 64
+      mode: 0666
+    - path: "/dev/ttyAMA0"
+      type: c
+      major: 204
+      minor: 64
+      mode: 0666
   capabilities:
     - all