request help: The APISIX dashboard should have its own independent docker image

[Miss-you]

Issue description

First of all, the dashboard should not be deployed on the forwarding node, but to expose services through a route (ingress)
Secondly, Skywalking and Kong, etc., their dashboard images are independent.

Environment

• apisix version (cmd: apisix version):
• OS:

[juzhiyuan]

We have Dockerfile for Dashboard Next now according to this issue :) but not on Dockerhub currently 🤔

#155

[juzhiyuan]

our contributor @bzp2010 helps us to add docker support for apisix-dashboard.