add build.grandchildren stage to workaround .default.trigger.children: https://gitlab.com/gitlab-org/gitlab/-/issues/225278

remove inline comment to see if it is the cause of https://git.conesphere.cloud/conesphere/podman/hub/apache/-/jobs/59391

remove replaced ci-extend+reference.podman.containerbuilds.yml ci-extend+reference.podman.containerbuilds.default.build.yml ci-extend+reference.no.stages.yml with podman and ci-extend+reference.podman.yml

as nested includes are now supported we added ci-extend+reference.podman.yml podman.default.build.yml podman.default.tasks.yml

replace ci_commit_branch with ci_commit_ref_name to see if it fixes issues with downstream trigger pipelines