GitHub Actions for Elixir (extended version with shared dependencies)

elixir.yml

# .github/workflows/elixir.yml

---
name: build

on: [push, pull_request]

jobs:
  dependencies:
    runs-on: ubuntu-latest

    strategy:
      matrix:
        elixir: ['1.12']
        otp: ['24']

    steps:
      - name: Cancel previous runs
        uses: styfle/cancel-workflow-action@0.9.0
        with:
          access_token: ${{ github.token }}

      - name: Checkout Github repo
        uses: actions/checkout@v2

      - name: Sets up an Erlang/OTP environment
        uses: erlef/setup-beam@v1
        with:
          elixir-version: ${{ matrix.elixir }}
          otp-version: ${{ matrix.otp }}

      - name: Retrieve cached dependencies
        uses: actions/cache@v2
        id: mix-cache
        with:
          path: |
            deps
            _build
            priv/plts
          key: ${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-${{ hashFiles('mix.lock') }}

      - name: Install dependencies
        if: steps.mix-cache.outputs.cache-hit != 'true'
        run: |
          mkdir -p priv/plts
          mix local.rebar --force
          mix local.hex --force
          mix deps.get
          mix deps.compile
          mix compile
          mix dialyzer --plt

  static-code-analysis:
    needs: dependencies

    runs-on: ubuntu-latest

    strategy:
      matrix:
        elixir: ['1.12']
        otp: ['24']

    steps:
      - name: Cancel previous runs
        uses: styfle/cancel-workflow-action@0.9.0
        with:
          access_token: ${{ github.token }}

      - name: Checkout Github repo
        uses: actions/checkout@v2

      - name: Sets up an Erlang/OTP environment
        uses: erlef/setup-beam@v1
        with:
          elixir-version: ${{ matrix.elixir }}
          otp-version: ${{ matrix.otp }}

      - name: Retrieve cached dependencies
        uses: actions/cache@v2
        id: mix-cache
        with:
          path: |
            deps
            _build
            priv/plts
          key: ${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-${{ hashFiles('mix.lock') }}

      - run: mix format --check-formatted
      - run: mix credo --strict
      - run: mix dialyzer --no-check --ignore-exit-status

  tests:
    runs-on: ubuntu-latest

    needs: dependencies

    strategy:
      matrix:
        elixir: ['1.12']
        otp: ['24']

    steps:
      - name: Cancel previous runs
        uses: styfle/cancel-workflow-action@0.9.0
        with:
          access_token: ${{ github.token }}

      - name: Checkout Github repo
        uses: actions/checkout@v2

      - name: Sets up an Erlang/OTP environment
        uses: erlef/setup-beam@v1
        with:
          elixir-version: ${{ matrix.elixir }}
          otp-version: ${{ matrix.otp }}

      - name: Retrieve cached dependencies
        uses: actions/cache@v2
        id: mix-cache
        with:
          path: |
            deps
            _build
            priv/plts
          key: ${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-${{ hashFiles('mix.lock') }}

      # - run: mix test --trace --slowest 10
      - run: mix coveralls