gh-127432: Add CI test for cross-builds #3

	name: Cross-Builds

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	cross-build:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: '3.x'

	- name: Install dependencies
	run: sudo apt-get install -y build-essential

	- name: Build host Python
	run: \|
	./configure --prefix=$PWD/workdir/host-python
	make -j4
	make install

	- name: Configure cross-build
	run: \|
	./configure --with-build-python=$PWD/workdir/host-python/bin/python --prefix=$PWD/workdir/cross-python
	make -j4

	- name: Run tests in build directory
	run: ./python -m test test_sysconfig test_site test_embed

	- name: Install cross-build
	run: make install

	- name: Run tests with installed Python
	run: $PWD/workdir/cross-python/bin/python -m test test_sysconfig test_site test_embed

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