setup-elixir

This action sets up an Elixir environment for use in a GitHub Actions workflow by:

Installing OTP
Installing Elixir

Note Currently, this action currently only supports Actions' ubuntu- runtimes.

Usage

Note The OTP release version specification is relatively complex. For best results, we recommend specifying exact OTP and Elixir versions. However, values like 22.x are also accepted, and we attempt to resolve them according to semantic versioning rules.

Additionally, it is recommended that one specifies OTP and Elixir versions using YAML strings, as these examples do, so that numbers like 23.0 don't end up being parsed as 23, which is not equivalent.

Basic example

on: push

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-elixir@v1
        with:
          otp-version: '22.2'
          elixir-version: '1.9.4'
      - run: mix deps.get
      - run: mix test

Matrix example

on: push

jobs:
  test:
    runs-on: ubuntu-latest
    name: OTP ${{matrix.otp}} / Elixir ${{matrix.elixir}}
    strategy:
      matrix:
        otp: ['20.3', '21.3', '22.2']
        elixir: ['1.8.2', '1.9.4']
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-elixir@v1
        with:
          otp-version: ${{matrix.otp}}
          elixir-version: ${{matrix.elixir}}
      - run: mix deps.get
      - run: mix test

Phoenix example

on: push

jobs:
  test:
    runs-on: ubuntu-latest

    services:
      db:
        image: postgres:11
        ports: ['5432:5432']
        env:
          POSTGRES_PASSWORD: postgres
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5

    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-elixir@v1
        with:
          otp-version: '22.2'
          elixir-version: '1.9.4'
      - run: mix deps.get
      - run: mix test

Authenticating with Postgres in Phoenix

When using the Phoenix example above, the postgres container has some default authentication set up. Specifically, it expects a username of "postgres", and a password of "postgres". It will be available at localhost:5432.

The simplest way of setting these auth values in CI is by checking for the GITHUB_ACTIONS environment variable that is set in all workflows:

# config/test.exs

use Mix.Config

# Configure the database for local testing
config :app, App.Repo,
  database: "my_app_test",
  hostname: "localhost",
  pool: Ecto.Adapters.SQL.Sandbox

# Configure the database for GitHub Actions
if System.get_env("GITHUB_ACTIONS") do
  config :app, App.Repo,
    username: "postgres",
    password: "postgres"
end

License

The scripts and documentation in this project are released under the MIT license.

Contributing

Check out this doc.

Current Status

This action is in active development.

niku/setup-elixir