Rewrite justfile into bun shell or dax or something

[hatoo]

oha/justfile

Lines 1 to 20 in 64b6a98

	[unix]
	pgo addtional-args="":
	#!/bin/bash
	# Disable trap in CI
	# `just` returns weired exit code if we use trap
	if [ -z $CI]; then trap "kill 0" EXIT; fi
	cargo run --release --manifest-path pgo/server/Cargo.toml &
	# Should be more than 1m
	cargo pgo run -- --profile pgo {{addtional-args}} -- -z 3m -c 900 --no-tui http://localhost:8888
	cargo pgo optimize build -- --profile pgo {{addtional-args}}
	set windows-powershell := true
	[windows]
	pgo addtional-args="":
	try { \
	$proc = Start-Process -NoNewWindow -PassThru cargo -ArgumentList 'run','--release','--manifest-path','pgo/server/Cargo.toml'; \
	cargo pgo run -- --profile pgo {{addtional-args}} -- -z 3m -c 900 --no-tui http://localhost:8888; \
	cargo pgo optimize build -- --profile pgo {{addtional-args}}; \
	} finally { Stop-Process -Id $proc.Id }

Currently, justfile is bad due to supporting the Corss platform.

I think it's good to rewrite it to a more cross-platform shell, like bun shell or dax or something.
I don't know which is better though.