Add GitHub actions workflows for unit testing, checking formatting, and updating actions #8

	name: Build and test

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

	jobs:
	build-and-test:
	strategy:
	matrix:
	buildtype: [debug, release]
	runs-on: ubuntu-24.04
	steps:
	- uses: actions/checkout@v4
	- name: Update apt repositories for ccache
	run: sudo apt update
	- name: Set up ccache
	uses: hendrikmuhs/ccache-action@v1.2
	with:
	key: ccache-linux-${{ matrix.buildtype }}
	- name: Setup compiler and build tools
	run: sudo apt install --no-install-recommends --yes g++-12 meson ninja-build
	- name: Configure
	run: \|
	CXX="ccache g++-12" meson setup \
	--buildtype ${{ matrix.buildtype }} \
	--warnlevel 3 \
	--werror \
	build .
	- name: Build
	run: ninja -C build
	- name: Test
	run: ./build/unit

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