update github action and readme for v4 #1

	name: CI

	on:
	push:
	branches:
	- 'v4'
	pull_request:
	branches:
	- 'v4'

	concurrency:
	group: ci-${{ github.event.pull_request.number \|\| github.ref }}
	cancel-in-progress: true

	jobs:
	build:
	strategy:
	matrix:
	centos_release: [ "7", "8" ]
	runs-on: ubuntu-latest
	steps:
	- name: Free disk space on Ubuntu runner
	uses: kfir4444/free-disk-space@main
	with:
	tool-cache: false
	android: true
	dotnet: true
	haskell: true
	large-packages: true
	swap-storage: true

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

	- name: Prepare CentOS container
	run: \|
	docker run --name=centos -id centos:${{ matrix.centos_release }}
	docker exec -i centos /bin/sh -c "sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*"
	docker exec -i centos /bin/sh -c "sed -i 's\|#baseurl=http://mirror.centos.org\|baseurl=http://vault.centos.org\|g' /etc/yum.repos.d/CentOS-*"
	docker exec -i centos yum install -y sudo git which wget make rpm-build gcc-c++ autoconf zlib-devel openssl-devel

	- name: Build RPM
	run: \|
	set -x

	working_path=/opt/oblogproxy
	docker cp . centos:${working_path}

	docker exec -i centos /bin/sh -c "export PROJECT_NAME=obbinlog-ce && sh ${working_path}/rpm/obbinlog-ce-build.sh ${working_path} obbinlog-ce 4.x $(date +%Y%m%d%H)"

	rpm_file=$(docker exec -i centos /bin/sh -c "ls ${working_path}/rpm/*.rpm")
	docker cp centos:${rpm_file} .

	- name: Upload artifact
	uses: actions/upload-artifact@v4
	with:
	name: rpm-el${{ matrix.centos_release }}
	path: "**.rpm"

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