v0.5.0

• Add validate subcommand. This validates API objects against the server's published OpenAPI schema. Online-only for now.
• Added opt-in "garbage collection" to update. If you run update repeatedly with the same --gc-tag value, then update will now delete API objects with that "tag" on the server that are no longer found in local config.
  • To start using this feature, just start using --gc-tag (and importantly specify the same set of input files on each invocation). "Stale" objects will be deleted on the second and subsequent update runs.
  • To stop using this feature, just stop using --gc-tag.
  • kubecfg update -v --gc-tag=foo --dry-run can be used to indicate what (if any) objects will be deleted (not a 100% accurate representation, since actually creating/updating objects might alter the state of the cluster)
  • Multiple disjoint pipelines pushing to the same cluster using different --gc-tag values and different input files are safe.