feat: use centralized tracking image (gitlab.com)

mentioned in commit 478c21bd

mentioned in merge request to-be-continuous/samples/python-on-azure!23 (merged)

mentioned in merge request to-be-continuous/samples/python-helmfile-on-kubernetes!53 (merged)

mentioned in merge request to-be-continuous/samples/python-on-kubernetes!44 (merged)

mentioned in merge request to-be-continuous/samples/golang-cnb-helm-on-kubernetes!47 (merged)

mentioned in merge request to-be-continuous/samples/golang-cnb-on-kubernetes!50 (merged)

mentioned in merge request to-be-continuous/samples/maven-on-openshift!51 (merged)

mentioned in merge request to-be-continuous/samples/python-serverless-on-aws!122 (merged)

mentioned in merge request to-be-continuous/samples/maven-on-gcloud!89 (merged)

mentioned in merge request to-be-continuous/samples/maven-on-kubernetes!101 (merged)

mentioned in merge request to-be-continuous/samples/freepascal-make-helm!22 (merged)

mentioned in merge request to-be-continuous/samples/golang-docker-on-aws!75 (merged)