Dockerfiles: correct ENV format
Avoid docker warning:
- LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format
Maintenance operation of our GitLab server is scheduled for Thursday, October 3rd at 2PM. The server will be unavailable for about 2 hours.
Avoid docker warning:
- LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format