feature request: Set config and cache flags via env variables

[mohsenari]

following up the thread in #226
(created for tracking)

be able to set --config and --cache flags using environment variable since it would allow users to set them in a Dockerfile:

ENV DEVBOX_CONFIG=.decontainer/.devbox.json
ENV DEVBOX_CACHE=/devbox/.devbox

[github-actions]

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[mohsenari]

please keep open