Apache ports, Composer version, locales and daemons from environment variables

[mistraloz]

Summary

This PR fixes :

• Bug
• Feature
• Breaking changes

Simple features configured with environment variables, one commit per issue.

1. Add environment variable to change Apache ports #360: Apache ports. APACHE_HTTP_PORT and APACHE_HTTPS_PORT (default 80 and 443), e.g. to use unprivileged
   ports in a Kubernetes cluster.
2. Be able to specify composer version #351: Composer version. COMPOSER_VERSION takes an exact version (2.4.4) or a channel (1, 2, 2.2).
   It is installed at the container start, or during the build of a slim image with ARG COMPOSER_VERSION.
3. Feature Request: Install locales through environment variables #212: locales. LOCALES="fr_FR.UTF-8 de_DE.UTF-8" generates these locales at the container start (~1s per
   locale, instant on restart). The locales package is installed in the fat images (~17MB) and with
   ARG INSTALL_LOCALES=1 in the slim images; otherwise the start fails with an explicit message.
4. [feature request] Add a process manager like supervisord #147: processes along with the main command. One container per process remains the recommended setup, and the
   documentation says so first. When it is not an option, DAEMON_COMMAND_* starts long-running processes (e.g. a
   queue worker), run by the docker user or by the user set in DAEMON_USER_* (name or ID). Nothing is restarted: as soon as one process (or the main
   command) exits, the other ones are stopped and the container stops with its exit code, so that Docker or the
   orchestrator sees the failure. On stop, Apache and PHP-FPM complete the running requests, the other processes
   receive SIGTERM. Supercronic is supervised the same way: the container no longer keeps running without cron
   jobs when Supercronic dies. The supervisor is a small bash script (utils/supervise.sh), only used when there is
   a process to run along with the main command.
5. Lots of <defunct> processes when using Cron #368: zombie processes of the cron jobs. Not reproducible on v5: sudo, PID 1 of the container, reaps the
   orphaned processes. A test now covers it.

Fixes #360
Fixes #351
Fixes #212
Fixes #147
Fixes #368

Test plan (required)

The test suite passes on PHP 8.2 to 8.5 for the cli, apache and fpm variants. New tests: test_httpPort
(variant-apache.sh), tool-composer-version.sh, tool-locales.sh, tool-daemon.sh (daemon output, default user and
DAEMON_USER, stop when a daemon fails, docker stop) and test_noZombie (tool-supercronic.sh).

Checklist

• I followed the guidelines in CONTRIBUTING guide
• I have squashed any insignificant commits
• This change has comments for package types, values, functions, and non-obvious lines of code