name: Elixir CI

on: push

jobs:
  build:

    runs-on: ubuntu-latest

    container:
      image: elixir:1.9.1-slim

    steps:
    - uses: actions/checkout@v1
    - name: Cache mix dependencies
      uses: actions/cache@v1
      with:
        path: deps
        key: ${{ runner.OS }}-mix-${{ hashFiles('**/mix.lock') }}
        restore-keys: |
          ${{ runner.OS }}-mix-
    - name: Install dependencies
      run: |
        mix local.rebar --force
        mix local.hex --force
        mix deps.get
    - name: Cache build files
      uses: actions/cache@v1
      with:
        path: _build
        key: ${{ runner.OS }}-build-${{ github.sha }}
        restore-keys: |
          ${{ runner.OS }}-build-
    - name: Run tests
      run: mix test