Use external make_toolchain.sh script plus other improvements #2

	name: Install libstdc++ headers

	on: [push]

	jobs:
	install-headers:
	runs-on: ubuntu-latest
	container: archlinux:latest

	steps:
	- name: Install dependencies
	run: pacman --noconfirm -Syu && pacman --needed --noconfirm -S base-devel git autoconf automake wget

	- name: Check out repository code
	uses: actions/checkout@v4

	- name: Git config
	run: git config --global --add safe.directory "$GITHUB_WORKSPACE"

	- name: Build toolchain
	run: \|
	set -ex
	wget https://gist.github.com/mintsuki/233faa49819aa91d7d2f8502ceaa94fe/raw/27565ee6baf7fa03105bab3fe6c3e50efa022558/make_toolchain.sh
	chmod +x ./make_toolchain.sh
	TARGET="x86_64-elf" ./make_toolchain.sh

	- name: Move headers
	run: \|
	set -ex
	mv ./include/features.h ./
	rm -rf include && mv toolchain/include/c++/* include
	mv ./features.h ./include/

	- name: Push
	run: \|
	set -ex
	git config user.name 'mintsuki'
	git config user.email '[email protected]'
	git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/osdev0/libstdcxx-headers.git
	git fetch --all
	git add include
	git commit -m "Upload headers [ci skip]"
	git push origin master

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