Decrypt secrets file to stdout

[jacobsvante]

Would be nice to be able to run helm secrets dec ./path/to/secrets.yaml without it cluttering secrets in one's project structure. Actually I'd go as far as to say that this should be the default. Would make it less likely that someone in the organization accidentally commits decrypted secrets.

Suggested API

To stdout:

helm secrets dec ./path/to/secrets.yaml

To file (current behavior):

helm secrets dec --save ./path/to/secrets.yaml
helm secrets dec -s ./path/to/secrets.yaml