Cypress Parallel tests Github Actions without Dashboard

# This is a basic workflow to help you get started with Actions
name: Project

# Controls when the action will run. Triggers the workflow on push or pull request
# events but only for the master branch
on:
  push:
    branches: [master, preprod, staging]
  pull_request:
    branches: [master, preprod, staging]

jobs:
  setup:
    runs-on: ubuntu-latest
    outputs:
      # will contain a json string with an array of n elements, each being a string of spec files delimited by ,
      test-chunks: ${{ steps['set-test-chunks'].outputs['test-chunks'] }}
      # json string with ids to use in the next job matrix depending on how many elements are in the above array, eg: [0,1]
      test-chunk-ids: ${{ steps['set-test-chunk-ids'].outputs['test-chunk-ids'] }}
    steps:
      - uses: actions/checkout@v2
      - id: set-test-chunks
        name: Set Chunks
        # get all spec files from the integration directory, group them to be at most 15 at a time and transform them to json
        run: echo "::set-output name=test-chunks::$(find cypress/integration -type f -name "*.spec.js" | xargs -n15 | tr ' ' ',' | jq -R . | jq -s -cM .)"
      - id: set-test-chunk-ids
        name: Set Chunk IDs
        # get the number of elements from the above array as an array of indexes
        run: echo "::set-output name=test-chunk-ids::$(echo $CHUNKS | jq -cM 'to_entries | map(.key)')"
        env:
          CHUNKS: ${{ steps['set-test-chunks'].outputs['test-chunks'] }}

  tests:
    needs:
      - setup
    runs-on: ubuntu-latest
    container:
      # use cypress image, since just using node 12 doesn't work currently for some reason, gives node-sass error
      image: cypress/browsers:node12.13.0-chrome78-ff70
      options: "--ipc=host" # fix for a cypress bug
    name: test (chunk ${{ matrix.chunk }})
    strategy:
      matrix:
        # will be for eg chunk: [0,1]
        chunk: ${{ fromJson(needs.setup.outputs['test-chunk-ids']) }}
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Add domain to hosts file
        run: echo "127.0.0.1 your.domain" | tee -a /etc/hosts

      # cache cypress and node_modules for faster operation
      -  uses: actions/cache@v2
         with:
           path: '~/.cache/Cypress'
           key: ${{ runner.os }}-cypress-${{ hashFiles('**/yarn.lock') }}

      - uses: actions/cache@v2
        with:
          path: '**/node_modules'
          key: ${{ runner.os }}-modules-docker-${{ hashFiles('**/yarn.lock') }}

      # in case cache is not valid, install the dependencies
      - run: yarn --frozen-lockfile
      - run: yarn run cypress install

      # run the frontend server in background and wait for it to be available
      - run: PORT=443 HTTPS=true yarn ci-start &
      - run: npx wait-on https://your.domain --timeout 180000

      # the cypress docker doesn't contain jq, and we need it for easier parsing of json array string.
      # This could be improved in the future, but only adds ~2s to the build time
      - run: apt-get install jq -y

      - name: Run Cypress
        run: SPECS=$(echo $CHUNKS | jq -cMr '.[${{ matrix.chunk }}] | @text') && yarn cypress:ci --spec $SPECS
        env:
          NODE_TLS_REJECT_UNAUTHORIZED: 0
          CHUNKS: ${{ needs.setup.outputs['test-chunks'] }}

  testsall:
    if: ${{ always() }}
    runs-on: ubuntu-latest
    name: Tests All
    needs: tests
    steps:
      - name: Check tests matrix status
        if: ${{ needs.tests.result != 'success' }}
        run: exit 1