[docker] Add support for binding dashboard to network interface

[FuNK3Y]

What does this implement/fix?

This allows to bind esphome dashboard to a specific network interface within docker.

Access to the esphome dashboard should be protected, as it provides direct access to secrets.

While this can be done with username & password, it is less convenient than offloading that to a reverse proxy and leverage OIDC for seamless SSO.

At the same time, esphome needs direct line of sight with the devices it manages for mdns discovery.

Until now satisfying the 2 conditions was tricky, because the dashboard could not be restricted to a specific interface. While esphome support binding the dashboard to a given ip address (https://esphome.io/guides/cli/#dashboard-command --address) the ip address is oftentimes dynamic in docker.

This PR introduces the following environment variable for docker: DASHBOARD_LISTENING_NETWORK_INTERFACE. When set to the name of the interface (i.e. eth0) the dashboard will only listen on the ip address of that given interface.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• The code change is tested and works locally.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated: Update networking instructions for ESPHome esphome-docs#5666

I will update the documentation accordingly - once there is a consensus about the implementation.