Replicated update fails with 'no such file or directory'

[MikaelSmith]

Trying to update an existing release with

replicated release update N --yaml-dir .

fails with

Error: read yaml dir: walk : lstat : no such file or directory

[MikaelSmith]

Found the issue for this. I'll have a PR up in a moment.

[MikaelSmith]

One thing that was odd about trying this is that I ended up updating a release that had already been promoted, which isn't possible in the GUI and feels wrong.