Use `portable_atomic` instead of `atomic-polyfill` #374

	name: CI
	on:
	pull_request:
	push:
	branches: ["master", "staging", "trying"]

	env:
	CARGO_INCREMENTAL: 0
	CARGO_NET_RETRY: 10
	CI: 1
	RUST_BACKTRACE: short
	RUSTFLAGS: -D warnings
	RUSTUP_MAX_RETRIES: 10

	jobs:
	test:
	name: Rust
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0 # fetch tags for publish
	- uses: Swatinem/rust-cache@359a70e43a0bb8a13953b04a90f76428b4959bb6
	- run: cargo run -p xtask -- ci
	env:
	CARGO_REGISTRY_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}
	MIRIFLAGS: -Zmiri-strict-provenance

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