cli: add a `backstage-cli info` command

Feature Suggestion

Similarly to the Tauri CLI, add an info command to backstage-cli that lists at least

• operating system
• node version
• npm version
• yarn version (even if this is expected to be the pinned one in the repo - still useful to look for deviations)
• the version of the currently running backstage-cli
• whether the current repo is a clone or a fork or a create-app generated repo?
• more? Perhaps actual resolved versions of backstage libraries that the app and backend packages build against?

Context

When helping users with issues, we very often ask for info like this. It would be very useful to be able to tell users to paste the output of this command as-is.

[OrkoHunter]

@lmasiero You’re running backstage-cli from a different place than the one on docs https://backstage.io/docs/deployment/docker#multi-stage-build

yarn --cwd packages/cli/bin backstage-cli ... vs yarn --cwd packages/backend backstage-cli

[autoamator]

@orihomie, had the same problem, what did the trick for me was adding following line:

RUN yarn tsc
RUN yarn add -W @backstage/cli #        <-----
RUN yarn --cwd packages/backend build