add ext-json #13

	name: libphpx
	on: [ push, pull_request ]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	php: [ 7.2, 7.3, 7.4, 8.0, 8.1, 8.2 ]
	steps:
	- uses: actions/checkout@v1
	- name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: "${{ matrix.php }}"
	extensions: embed, curl, redis, json
	- name: install dependencies
	run: sudo apt update -y && sudo apt install -y googletest libgtest-dev libboost-stacktrace-dev
	- name: Show machine information
	run: \|
	date
	env
	uname -a
	ulimit -a
	php -v
	php --ini
	ls -al
	pwd
	echo "`git log -20 --pretty --oneline`"
	echo "`git log -10 --stat --pretty --oneline`"
	- name: build
	run: cmake . && make VERBOSE=1 -j$(nproc)
	- name: run tests
	run: cd tests && cmake . && make VERBOSE=1 -j$(nproc) && ./bin/phpx_tests

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