Pass gitlab.envName to running containers

Problem

When trying to use Feature Flags with AutoDev Ops, it's not currently possible to know which GitLab environment you're running in.

Proposed Solution

Take the gitlab.envName values that's added in gitlab-org/cluster-integration/auto-deploy-image!21 (merged) and pass to running containers.

Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/65735