Question: Assumptions around variable templating

[meganwolf0]

Is your feature request related to a problem? Please describe.

Currently, variable templating is only supported when it's defined in the configuration file. Wondering if we should support templating variables as pulled directly out of the environment? E.g., if an envvar has a prefix of LULA_VAR_WHATEVER, it will automatically be attempted to template.

Expected Deliverable

Discussion on if this is something we want to support, what drawbacks/other considerations might be. For instance, setting the variables explicitly in the config may reduce side-effects and ensures enforcement of sensitive/non-sensitive behavior. Alternatively, this requires more boilerplate to inject simple values (e.g., an api key for instance).