run bootstrap jam without parallelism #6

	name: bootstrap
	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]
	jobs:
	bootstrap:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	target: [arm, arm64, riscv64, x86_64]

	steps:
	- name: checkout haiku (from github due to performance)
	uses: actions/checkout@v3
	with:
	repository: haiku/haiku
	path: haiku

	- name: tag current commit from haiku
	working-directory: haiku
	run: git tag $(git ls-remote https://review.haiku-os.org/haiku refs/tags/hrev* \| awk '/'$(git rev-parse HEAD)'/ { gsub(/refs\/tags\//, ""); print $2 }')

	- name: checkout buildtools (from github due to performance)
	uses: actions/checkout@v3
	with:
	repository: haiku/buildtools
	path: buildtools

	- name: checkout haikuporter
	uses: actions/checkout@v3
	with:
	repository: haikuports/haikuporter
	path: haikuporter

	- name: checkout haikuports
	uses: actions/checkout@v3
	with:
	repository: haikuports/haikuports
	path: haikuports

	- name: checkout haikuports.cross
	uses: actions/checkout@v3
	with:
	path: haikuports.cross

	- name: create build directory
	run: mkdir build

	- name: install ubuntu packages
	run: sudo apt install -y nasm

	- name: install jam
	working-directory: buildtools/jam
	run: \|
	make
	./jam0 install

	- name: configure for ${{ matrix.target }}
	working-directory: build
	run: ../haiku/configure --build-cross-tools ${{ matrix.target }} --cross-tools-source ../buildtools --bootstrap ../haikuporter/haikuporter ../haikuports.cross ../haikuports -j$(nproc)

	- name: jam @bootstrap-raw for ${{ matrix.target }}
	working-directory: build
	run: jam -q @bootstrap-raw

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