Using GitHub Actions as a CI for Swift project

Here's a config for a GitHub Actions workflow to build a Swift project. This example is for building a Vapor project using Swift 5.0.3 on Ubuntu 18.04:

name: Ubuntu 18.04 Swift 5.0.3

on: [push]

jobs:
  build_on_ubuntu:
    runs-on: ubuntu-18.04

    steps:
    - name: Install dependencies
      run: sudo apt-get update; sudo apt-get install -yq libssl-dev zlib1g-dev

    - name: Checkout
      uses: actions/checkout@master

    - name: Download Swift
      run: curl https://swift.org/builds/swift-5.0.3-release/ubuntu1804/swift-5.0.3-RELEASE/swift-5.0.3-RELEASE-ubuntu18.04.tar.gz --output swift.tar.gz

    - name: Unpack Swift
      run: |
          tar xzf swift.tar.gz
          mv swift-5.0.3-RELEASE-ubuntu18.04 swift

    - name: Swift build
      run: |
          export PATH=$(pwd)/swift/usr/bin:"${PATH}"
          swift build -c release