Add xtask msrv #436

	## Run the TaskChampion tests, using both the minimum supported rust version
	## and the latest stable Rust.

	name: tests - rust

	on:
	push:
	branches:
	- develop
	pull_request:
	types: [opened, reopened, synchronize]

	jobs:
	test:
	strategy:
	matrix:
	rust:
	# MSRV; must not be higher than the clippy rust version in checks.yml
	- "1.64"
	- "stable"
	os:
	- ubuntu-latest
	- macOS-latest
	- windows-latest

	name: "rust ${{ matrix.rust }} on ${{ matrix.os }}"
	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/checkout@v4

	- name: Cache cargo registry
	uses: actions/cache@v3
	with:
	path: ~/.cargo/registry
	key: ${{ runner.os }}-${{ matrix.rust }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}

	- name: Cache cargo build
	uses: actions/cache@v3
	with:
	path: target
	key: ${{ runner.os }}-${{ matrix.rust }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}

	- uses: actions-rs/toolchain@v1
	with:
	toolchain: "${{ matrix.rust }}"
	override: true

	- name: test
	run: cargo test

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