Option to run Deno with minimal privileges

[SergioMartinSanchez]

Hello! First of all, congratulations on this runtime, it's a gem.
I was wondering if it would be possible to add an option to run functions with minimal privileges. In our case, we want the functions to not have permission to access the network, or only have access to a few specific domains.
Best regards and thanks!

[TooTallNate]

Hi! Currently the --allow-all is hard-coded, but I would be open to a pull request making it configurable.

Note though that the Lambda Runtime API requires access to the HTTP server located at the value container in env var AWS_LAMBDA_RUNTIME_API, so that will need to always be allowed.