Basic Elixir CI (Felt's starting point)

elixir-ci.yml

name: Build and Test Elixir Server

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

jobs:
  build:
    name: Build and test
    runs-on: ubuntu-latest
    env:
      MIX_ENV: test
    strategy:
      matrix:
        elixir: ["1.13.1"]
        otp: ["24.0.5"]
        node-version: ["16.8.0"]

    services:
      db:
        image: postgis/postgis:13-3.1
        env:
          POSTGRES_DB: server_test
        ports: ["5432:5432"]
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
    steps:
      - name: Checkout repository
        uses: actions/checkout@v2

      - name: Setup elixir
        uses: erlef/setup-beam@v1
        with:
          elixir-version: ${{ matrix.elixir }}
          otp-version: ${{ matrix.otp }}

      - name: Get deps cache
        uses: actions/cache@v2
        with:
          path: deps/
          key: >-
            deps-${{ runner.os }}-${{ matrix.otp }}-
            ${{ matrix.elixir }}-${{ hashFiles('**/mix.lock') }}

      - name: Get build cache
        uses: actions/cache@v2
        with:
          path: _build/test/
          key: >-
            build-${{ runner.os }}-${{ matrix.otp }}-
            ${{ matrix.elixir }}-${{ hashFiles('**/mix.lock') }}

      - name: Install Dependencies
        run: |
          mix local.rebar --force
          mix local.hex --force
          mix deps.get
          mix deps.compile
      - name: Check for unused deps
        run: mix deps.unlock --check-unused
      - name: Compile code
        run: mix compile --warnings-as-errors
      - name: Check code formatting
        run: mix format --check-formatted
      - name: Run Credo
        run: mix credo suggest --min-priority=normal
      - name: Run Migrations
        run: mix ecto.migrate
      - name: Run Tests
        run: mix coveralls.json --warnings-as-errors
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}