Consider amber as alternative to Bash

[josecelano]

We have been using bash for scripting. Especially for CI.

We have also tried using Rust. See: https://github.com/torrust/torrust-tracker/blob/develop/src/bin/e2e_tests_runner.rs

Although I'm happy with Bash and Rust we could consider amber as an alternative to Bash.

In general, I prefer Rust for complex tasks not demanding much interaction with third-party commands or capturing output (pipelines). For things where Bash fits better we could consider amber.

cc @da2ce7