feat: change redis container hostname with env

[stasadev]

The Issue

• Valkey as additional service - redis alternative #28 (comment)

Could it be indicated somehow, when another backend than Redis is in use, like changing CLI wording to valkey:6379> ... or maybe it's not really possible?

How This PR Solves The Issue

Adds override for the container hostname.

Manual Testing Instructions

ddev add-on get https://github.com/ddev/ddev-redis/tarball/20251101_stasadev_hostname ddev redis-backend valkey ddev restart ddev redis-cli # see valkey:6379>

Automated Testing Overview

Release/Deployment Notes

[gitressa]

Thanks for a fast solution @stasadev! It works perfectly, and valkey:6379> is now shown in the command line.

To put the cherry on top, backend could be included under ddev describe? If you agree, it could also be mentioned in the README under Usage:

Usage

Command	Description
[...]	[...]
ddev describe	View service status, used ports, and backend for Redis

$ ddev describe ┌────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │ Project: drupal10 ~/dev/drupal10 https://drupal10.ddev.site │ │ Docker platform: linux-docker │ │ Router: traefik │ │ DDEV version: v1.24.8 │ ├──────────────┬──────┬─────────────────────────────────────────────────────────────────┬────────────────────┤ │ SERVICE │ STAT │ URL/PORT │ INFO │ ├──────────────┼──────┼─────────────────────────────────────────────────────────────────┼────────────────────┤ │ web │ OK │ https://drupal10.ddev.site │ drupal11 PHP 8.3 │ │ │ │ InDocker -> Host: │ Server: nginx-fpm │ │ │ │ - web:80 -> 127.0.0.1:32816 │ Docroot: 'web' │ │ │ │ - web:443 -> 127.0.0.1:32817 │ Perf mode: none │ │ │ │ - web:8025 -> 127.0.0.1:32818 │ Node.js: 22 │ ├──────────────┼──────┼─────────────────────────────────────────────────────────────────┼────────────────────┤ │ redis │ OK │ InDocker: │ Backend: Valkey │ │ │ │ - redis:6379 │ │ 

[stasadev]

Good idea, but we need to wait for v1.24.9 to include that in ddev describe.

I'll hold off on pulling this PR until then (I'll make a new release in a few days) so I can add that change.

[gitressa]

Sounds great, I am looking forward to the next release, and even more improvements.