Add a detach() systeam call #370

	name: Run builds and tests

	on:
	push:
	branches: [ '*' ]
	pull_request:
	branches: [ $default-branch ]

	jobs:
	build:

	runs-on: ubuntu-20.04

	steps:
	- uses: actions/checkout@v2
	- name: Install xcompiler
	run: ./scripts/install-ci.sh
	- name: Print xcompiler version
	run: riscv64-linux-gnu-gcc --version
	- name: Build qemu-image
	run: make build-qemu-image
	- name: Run virt dry-run tests
	run: make out/test-output-virt.txt
	- name: Run u64 dry-run tests
	run: make out/test-output-u64.txt
	- name: Run u32 dry-run tests
	run: make out/test-output-u32.txt
	- name: Run virt smoke tests
	run: make out/smoke-test-output-virt.txt
	- name: Run u64 smoke tests
	run: make out/smoke-test-output-u64.txt
	- name: Run u32 smoke tests
	run: make out/smoke-test-output-u32.txt
	- name: Run tiny-stack smoke tests
	run: make out/smoke-test-output-tiny-stack.txt
	- name: Make all binaries
	run: make all

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