Finally had to fork godotenv because it strips comments and we need
those to parse length values (e.g. "FOO=v1 # length=10") (or in other
words, motivation to move to the YAML format).
There is a new secret module now, with functionality for dealing with
generation and parsing of secrets.
The final output needs some work and there is also the final step of
implementing the sending of secrets to the docker daemon. Coming Soon
™️.
