Allow for JSON environment variables

[victor-ufg]

What is the problem you are trying to solve by the feature?

I want to use JSON strings in environment variables. As a nice to have, those JSON strings could be multiline.

What is the solution do you propose?

To have a way to skip html entity encoding of variables.

What changes in deploy.yml format do you propose?

As a nice to have, allow for multiline Yaml strings. Currently, if I try to do multiline, the sdk will silently go on, but the docker/sdk up will fail:

What changes in command line interface do you propose?

To not to encode env variables with html entities (see screenshot above).

What alternatives have you considered?

none.