riscv: add GitHub Actions workflow for RISC-V testing with QEMU (#1) #2

	name: RISC-V Testing

	on:
	push:
	branches:
	- riscv
	- v2.1-riscv64

	jobs:
	test-riscv:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	strategy:
	matrix:
	qemu-cpu: [rv64, rva22u64]

	steps:
	- name: Checkout LuaJIT
	uses: actions/checkout@v4

	- name: Install RISC-V toolchain and QEMU
	run: \|
	sudo apt-get update
	sudo apt-get install -y \
	build-essential \
	gcc-riscv64-linux-gnu \
	qemu-user-static

	- name: Build LuaJIT for RISC-V
	run: \|
	make clean
	make -j \
	CROSS=riscv64-linux-gnu- \
	BUILDMODE=mixed \
	CCOPT="-O2 -fomir-fram-pointer" \
	CFLAGS_riscv64="-march=rv64gc" \
	# Note: Building with baseline rv64gc ISA for maximum compatibility.
	# CPU-specific features are tested via QEMU's -cpu flag at runtime.

	- name: Verify LuaJIT binary
	run: \|
	file src/luajit
	qemu-riscv64-static -cpu ${{ matrix.cpu }} src/luajit -v

	- name: Checkout LuaJIT-test-cleanup
	uses: actions/checkout@v4
	with:
	repository: LuaJIT/LuaJIT-test-cleanup
	path: test-suite

	- name: Run LuaJIT test suite with ${{ matrix.cpu }}
	run: \|
	cd test-suite
	echo "Running tests with CPU: ${{ matrix.cpu }}"
	for i in {1..372} {374..379} {381..517}; do
	qemu-riscv64-static -cpu ${{ matrix.qemu-cpu }} -L /usr/riscv64-linux-gnu \
	../src/luajit test/test.lua +slow $i
	done

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