GitLab

• Add credo (dev dependencies in Mix config + new job
• Add dyalizer job
• Add cache (for dependencies, build artefacts)
• Sequentialize jobs to use cache (maybe use depends:, should we use stage: when using depends:?)
  • dev sequence: dyalizer -> pages
  • test sequence: test -> format -> credo

As an example, here's a .gitlab-ci.yml from another Elixir project:

credo:
  image: $CONTAINER_BUILD_IMAGE
  stage: static_analysis
  cache:
    key: "$CI_JOB_NAME"
    paths:
      - deps
      - _build
      - .rebar3
  variables:
    MIX_ENV: test
  before_script:
    - mix local.hex --force
    - mix local.rebar --force
  script:
    - mix deps.get --only test
    - mix credo --strict

test:
  image: $CONTAINER_BUILD_IMAGE
  services:
    - postgres
  stage: test
  cache:
    key: "$CI_JOB_NAME"
    paths:
      - deps
      - _build
      - .rebar3
      - assets/node_modules
  variables:
    MIX_ENV: test
  before_script:
    - mix local.hex --force
    - mix local.rebar --force
  script:
    - mix deps.get --only test
    - mix compile
    - npm install --prefix ./assets
    - mix ecto.setup
    - mix test