Option for enabling the "Offline" mode with a flag like --prefer-offline

[daguitosama]

Feature description

A way to tell the CLI to use the fallback local cache of the secrets instead attempting to use the network. As described on #1609

Why would it be useful?

When developing locally, on a very very unstable network, you end up waisting a lot of time waiting to fetch secrets. If you know those secrets haven't change, there is no point to make a roundtrip and keep a connection open waiting to reload secrets. Been able to bypass the network is going to help a lot in this unaffortunate scenario.

Additional context

Using the CLI when developing locally. On a very bad network.