build: reduce binary size

[Jayllyz]

Summary

Biome recently reached 5M downloads! However, with the current npm binary size of 29MB (v1.9.4), this translates to 100TB+ of cumulative download data. This PR aims to optimize the binary size to reduce bandwidth usage.

Binary size optimization results (tested on commit 3401663):

• Before: 32.9MB (only lto)
• After: 30.45MB (codegen-units=1)

All options are explained here : https://doc.rust-lang.org/cargo/reference/profiles.html

• Set codegen-units = 1: Can reduces binary size and improves runtime performance

Test Plan

Tested on Sentry repo like ecosystem-ci (6164 files)

[ematipico]

Actually, we already set some of those flags in the CI.

biome/.github/workflows/release_cli.yml

Lines 128 to 129 in 3401663

	# Strip all debug symbols from the resulting binaries
	RUSTFLAGS: "-C strip=symbols"

The reason why they aren't set in Cargo.toml is that we want to create a local release as fast as possible.

So you might want to redirect those new flags in the CI job instead. What do you think?

[Jayllyz]

In fact, we've already defined some of these flags in the CI.

My bad, haven't checked the CI files...
I'll add the codegen unit flags here then.

[arendjr]

Do you know what the impact is with only the codegen unit change?

[Jayllyz]

Do you know what the impact is with only the codegen unit change?

30.45MB
with this config

[profile.release]
codegen-units = 1
lto           = true