add vultr example

Signed-off-by: Riyaz Faizullabhoy <riyaz.faizullabhoy@docker.com>

examples/vultr.yml

@@ -0,0 +1,39 @@
+kernel:
+  image: "linuxkit/kernel:4.9.34"
+  cmdline: "console=ttyS0 page_poison=1"
+init:
+  - linuxkit/init:36c56f0664d49c5a6adc1120d1bf5ba6ac30b389
+  - linuxkit/runc:291131ec026430371e7c36165c3f43734fbc2541
+  - linuxkit/containerd:1e3e8f207421de8deac8cedc26a138d6b1661a0d
+  - linuxkit/ca-certificates:46b59484919bfa9af700e54e042048cb06261de4
+onboot:
+  - name: sysctl
+    image: "linuxkit/sysctl:3aa6bc663c2849ef239be7d941d3eaf3e6fcc018"
+  - name: dhcpcd
+    image: "linuxkit/dhcpcd:6c1ca76dbf808d5c27d10cbf22a8d4399be5c8ae"
+    command: ["/sbin/dhcpcd", "--nobackground", "-f", "/dhcpcd.conf", "-1"]
+  - name: metadata
+    image: "linuxkit/metadata:09781c8a8097e5aa3ae522c74856d80e1da3b915"
+services:
+  - name: getty
+    image: "linuxkit/getty:6cbeee0392b0670053ce2bf05a5a0d67ec2bce05"
+    env:
+     - INSECURE=true
+  - name: rngd
+    image: "linuxkit/rngd:b50b22dd574c5377708977af769f053009fff6d5"
+  - name: sshd
+    image: "linuxkit/sshd:f095b62ddca658e99d5751872c933ef3d5d18cec"
+    binds:
+     - /var/config/ssh/authorized_keys:/root/.ssh/authorized_keys
+  - name: nginx
+    image: "nginx:alpine"
+    capabilities:
+     - CAP_NET_BIND_SERVICE
+     - CAP_CHOWN
+     - CAP_SETUID
+     - CAP_SETGID
+     - CAP_DAC_OVERRIDE
+trust:
+  org:
+    - linuxkit
+    - library