chore(release): 20.0.0 #221

	# Push to master workflow.
	#
	# Runs when a PR has been merged to the master branch.
	#
	# 1. Generates a release build.
	# 2. If the last commit is a version change, publish.

	name: Master

	on:
	push:
	branches:
	- master

	env:
	# Run all cargo commands with --verbose.
	CARGO_TERM_VERBOSE: true
	RUST_BACKTRACE: 1

	jobs:
	build:
	name: Build
	runs-on: ${{ matrix.os }}
	if: "startsWith(github.event.head_commit.message, 'chore(release):')"

	strategy:
	matrix:
	os: [ubuntu-latest, windows-latest, macOS-latest]
	steps:
	- uses: actions/checkout@v2
	# Install Rust
	- uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: stable
	override: true

	# Cache.
	- name: Cargo cache registry, index and build
	uses: actions/[email protected]
	with:
	path: \|
	~/.cargo/registry
	~/.cargo/git
	target
	key: ${{ runner.os }}-cargo-cache-${{ hashFiles('**/Cargo.lock') }}

	# Make sure the code builds.
	- name: Build
	run: cargo build --release

	# Publish if we're on a tag here.
	publish:
	name: Publish
	runs-on: ubuntu-latest
	needs: build
	if: "startsWith(github.event.head_commit.message, 'chore(release):')"
	steps:
	- uses: actions/checkout@v2
	# checkout with fetch-depth: '0' to be sure to retrieve all commits to look for the semver commit message
	with:
	fetch-depth: '0'

	## Install Rust
	- uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: stable
	override: true

	# Publish to crates.io.
	- uses: actions-rs/cargo@v1
	with:
	command: login
	args: ${{ secrets.CRATES_IO_TOKEN }}
	- uses: actions-rs/cargo@v1
	with:
	command: package
	- uses: actions-rs/cargo@v1
	with:
	command: publish

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