PipelineTest in a fresh JVM, three times, with the environment set by the test.

CI unset, ENV=DEV (a developer laptop):
  integrationWithExternalAPI() : SKIPPED  (Environment variable [ENV] with value [DEV] does not match regular expression [STAGING])
  performanceBenchmark() : SKIPPED  (Environment variable [CI] does not exist)

CI=true, ENV=STAGING (a pipeline):
  integrationWithExternalAPI() : PASSED
  performanceBenchmark() : PASSED

CI=false, ENV unset:
  integrationWithExternalAPI() : SKIPPED  (Environment variable [ENV] does not exist)
  performanceBenchmark() : SKIPPED  (Environment variable [CI] with value [false] does not match regular expression [true])