ci_cd.yml

name: CI/CD

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main
env:
  MIX_ENV: test
  DATABASE_USER: postgres
  DATABASE_PASSWORD: postgres
  DATABASE_NAME: test_db

jobs:
  ci:
    name: CI
    runs-on: ubuntu-latest
    services:
      postgres:
        # Dockerhub image
        image: postgres
        env:
          POSTGRES_PASSWORD: postgres
        # Set health checks to wait until postgres has started
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
        ports:
          # Maps tcp port 5432 on service container to the host
          - 5432:5432
    steps:
      - name: Checkout Code
        uses: actions/checkout@v3

      - name: Set up Elixir
        uses: erlef/setup-beam@v1
        with:
          version-file: ".tool-versions"
          version-type: "strict"

      # Step: Define how to cache deps. Restores existing cache if present.
      - name: Cache deps
        id: cache-deps
        uses: actions/cache@v3
        env:
          cache-name: cache-elixir-deps
        with:
          path: deps
          key: deps-${{ runner.os }}-mix-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
          restore-keys: |
            ${{ runner.os }}-mix-${{ env.cache-name }}-

      # Step: Define how to cache the `_build` directory. After the first run,
      # this speeds up tests runs a lot. This includes not re-compiling our
      # project's downloaded deps every run.
      - name: Cache compiled build
        id: cache-build
        uses: actions/cache@v3
        env:
          cache-name: cache-compiled-build
        with:
          path: _build
          key: _build-${{ runner.os }}-mix-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
          restore-keys: |
            _build-${{ runner.os }}-mix-${{ env.cache-name }}-
            _build-${{ runner.os }}-mix-

      # Step: Conditionally bust the cache when job is re-run.
      # Sometimes, we may have issues with incremental builds that are fixed by
      # doing a full recompile. In order to not waste dev time on such trivial
      # issues (while also reaping the time savings of incremental builds for
      # *most* day-to-day development), force a full recompile only on builds
      # that are retried.
      - name: Clean to rule out incremental build as a source of flakiness
        if: github.run_attempt != '1'
        run: |
          mix deps.clean --all
          mix clean
        shell: sh

      - name: Install deps, compile deps, and build PLTs
        run: mix do deps.get, deps.compile, dialyzer --plt

      - name: Run Check
        run: mix check
        env:
          SECRET_KEY_BASE: ${{ secrets.SECRET_KEY_BASE }}

  cd:
    name: Deploy apps
    needs: [ci]
    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3
      - uses: superfly/flyctl-actions/setup-flyctl@master

      - name: Deploy website
        run: flyctl deploy --remote-only
        env:
          FLY_API_TOKEN: ${{ secrets.FLY_WEBSITE_API_TOKEN }}

      - name: Deploy metrics app
        run: flyctl deploy --remote-only ./livebook/
        env:
          FLY_API_TOKEN: ${{ secrets.FLY_METRICS_API_TOKEN }}