Change default output directory

[jschoone]

/kind feature

Describe the solution you'd like
The default output directory for csctl create (./releases) differs from the default for the Tilt local_mode (./.release).
For a better user/developer experince it should be consistent.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• csctl version: (use csctl version)