Support mobile app local development access from devices over nip.io (wildcard DNS)

[jayohms]

To support mobile devices pointed to a local development machine, this:

• Binds local development to 0.0.0.0 for nip.io support
• Configures the host for development

This change depends on #2291 for non-secure write requests.

In general, to fix missing-anchor issues, change regexes so they match the entire intended value rather than any substring, using \A and \z (or ^ and $ only when line-based behavior is explicitly desired). For hostnames, you usually want “host ends with .example.com” or similar, not “string contains .example.com somewhere”.

Here, config.hosts should allow any host under the ts.net domain. The simplest, least-disruptive fix is to replace /.*\.ts\.net/ with an anchored pattern that still allows any subdomain but ensures .ts.net is at the end of the host (ignoring an optional port). For example:

• Use \A and \z to anchor the whole host string.
• Permit an optional :<port> after the hostname to match how Rails may include ports in config.hosts.
• Keep the comment semantics (“hostname.tail1234.ts.net”) intact.

A robust replacement is:

/\A.*\.ts\.net(?::\d+)?\z/

This matches any string that:

• Starts with anything ending in .ts.net
• Optionally has :PORT after it
• Has no trailing extra characters.

Concretely, in config/environments/development.rb, line 93 should be changed from /.*\.ts\.net/ to /\A.*\.ts\.net(?::\d+)?\z/. No new imports or methods are needed; it’s a direct regex literal change.

[jeremy]

Rails add the anchors, confusingly.