Introduce maven central mirror parameter

[yannickchristhomas]

No description provided.

[schnatterer]

After working through my comments please rebase on main.

After starting the GOP, both petclinic-plain and petclinic-helm failed with this:

java.io.FileNotFoundException: The specified user settings file does not exist: /tmp/gitops-playground-jenkins-agent/workspace/xample-apps_petclinic-plain_main/.m2/settings.xml

After restarting the jobs, they succeeded. Did those work fine for you?

Please also do a negative test: When --maven-central-mirror is not set, we don't want a an empty env var here
http://jenkins.localhost/manage/configure

For the record, this is how I tested

 docker run --rm -t  -u $(id -u)  \
  -v ~/.config/k3d/kubeconfig-gitops-playground.yaml:/home/.kube/config \
    --net=host \
      gitops-playground:dev --yes -x --argocd --base-url=http://localhost --ingress-nginx  --maven-central-mirror https://maven-central.storage.googleapis.com/maven2/ 

[schnatterer]

Almost there 👍 🙂
Maybe I confused you with the comment about the test. If so, lets talk about it.