Parallel jobs per stage

---

examples/pipelines/parallel-jobs/.gitlab-ci.yml

build job:
    stage: build
    script: echo Build

unit-test-job:
    stage: test
    script: echo Unit Test

integration-test-job:
    stage: test
    script: echo Integration Test

acceptance-test-job:
    stage: test
    script: echo Acceptance Test

deploy-job:
    stage: deploy
    script: echo Deploy

upload-job:
    stage: deploy
    script: echo  Upload