Running just gdb with a config file

[Wesdcv]

Description

The existing justfile provides commands for building, running firmware, and invoking GDB. However, there is currently no backend for running just gdb with a specific configuration file.

It would be nice to be able to choose with which config to run gdb, like:

# Connect a debugger to a running Miralis instance
# Have some config as a default one
gdb config=/* some default config */:
	cargo run --package runner -- gdb --config {{config}}