Prepare release 0.3.0 #54

	# Note: to work on CI, use https://github.com/nektos/act 👍

	name: CI

	on:
	push:
	branches: [main]
	pull_request:
	branches: [main]

	env:
	# need atomic CAS, so Cortex-M0/1 are out
	QEMU_TARGET: thumbv7m-none-eabi

	jobs:
	test:
	# want QEMU >=4
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	with:
	submodules: true
	- uses: RustCrypto/actions/cargo-cache@master
	- uses: dtolnay/rust-toolchain@stable
	with:
	targets: thumbv7em-none-eabi,thumbv7em-none-eabihf,thumbv8m.main-none-eabi
	- uses: carlosperate/arm-none-eabi-gcc-action@v1

	- name: Install build dependencies
	shell: bash
	run: \|
	sudo apt-get update -y -qq >/dev/null
	sudo apt-get install -y -qq llvm libc6-dev-i386 libclang-dev make time qemu-system-arm >/dev/null
	cc --version
	qemu-system-arm --version
	arm-none-eabi-gcc --version

	- name: Check that all crates check without warning
	run: make check

	- name: Check formatting + lints
	run: make lint

	- name: Build PC
	run: cargo build --release
	shell: bash

	- name: Build Cortex-M4 (soft)
	run: cargo build --release --target thumbv7em-none-eabi
	shell: bash

	- name: Run all of the tests, including QEMU tests
	run: make test
	shell: bash

Provide feedback