Implement `Borrow` for `Key` #22

	on:
	push:
	branches:
	- main
	tags:
	- "*"
	pull_request:

	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true

	name: CI
	jobs:
	lint:
	name: Lint
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@v4
	- uses: dtolnay/rust-toolchain@stable

	# make sure all code has been formatted with rustfmt
	- name: check rustfmt
	run: \|
	rustup component add rustfmt
	cargo fmt -- --check --color always

	# run clippy to verify we have no warnings
	- run: cargo fetch
	- name: cargo clippy
	run: \|
	rustup component add clippy
	cargo clippy --all-targets --all-features -- -D warnings

	test:
	name: Test
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@v4
	- uses: dtolnay/rust-toolchain@stable
	- run: cargo fetch
	- name: cargo test build
	run: cargo build --tests
	- name: cargo test
	run: cargo test

	deny:
	name: cargo-deny
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@v4
	- uses: EmbarkStudios/cargo-deny-action@v1

	publish-check:
	name: Publish Check
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@v4
	- uses: dtolnay/rust-toolchain@stable
	- run: cargo fetch
	- name: cargo publish check
	run: cargo publish --dry-run -p toml-span

	test_success:
	runs-on: ubuntu-22.04
	needs: [lint,test,deny,publish-check]
	steps:
	- run: echo "All test jobs passed"

Provide feedback