What is the meaning of jdk8 in deploy:jdk8

Hi,

I am looking at the Gitlab maven template.

The code is something like this:

.verify: &verify
  stage: test
  script:
    - 'mvn $MAVEN_CLI_OPTS verify'
  except:
    - master

verify:jdk8:
  <<: *verify

What is the meaning of jdk8 in verify:jdk8:?

Is it just decoration? Is it linking to a runner?

I’ve read through all the documentation and failed to understand.