[docker] allow to read REQUIRED variables from environments
- REQUIRED variables are commented in the 'all-in-one.conf' when it's auto generated.
- commented variables are not loaded in the config dictionary (of course…)
- variables which are not present in the config dictionary cannot be dynamically overwritten.
One should be able to dynamically set REQUIRED variables from environment variables in the container.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information