Add command to run all tests in parallel

[bahmutov]

Need a command to check out code, install dependencies and run all tests in parallel

[bahmutov]

easy to pass --parallel parameter, but hard to pass parallelism integer, I have opened an issue with Circle about this CircleCI-Public/config-preview-sdk#121

Using string parallelism parameter breaks CircleCI and the job keeps hanging https://circleci.com/workflow-run/b5a654d5-e679-4aed-be56-200f1d977236

[bahmutov]

For now used template in yaml to define parallel-1x, parallel-2x, ... parallel-10x jobs and used them from this project like

version: 2.1
orbs:
  cypress: cypress/cypress@dev:0.0.1
workflows:
  build:
    jobs:
      - cypress/install
      - cypress/parallel-3x:
          requires:
            - cypress/install
          group: "3x"

[bahmutov]

If jobs support parallelism parameter then it would be simply

version: 2.1
orbs:
  cypress: cypress/cypress@dev:0.0.1
workflows:
  build:
    jobs:
      - cypress/install
      - cypress/run:
          requires:
            - cypress/install
          parallelism: 3
          parallel: true
          group: "3x"