Add support for parsing config file for basti init

[Sharu95]

Proposed Changes

This PR adds support for parsing the config file for the basti init command.

Related Issues/PRs

Checklist

• I cleaned up my code.
• All the tests and checks passed (npm run test).
• I have added necessary documentation and/or updated existing documentation.
• I have added or modified tests to cover the changes.

[BohdanPetryshyn]

Hi @Sharu95, thank you for your interest in contributing to Basti!

I'll try to look at the changes this weekend. Meanwhile, could you please explain the motivation for the changes and the example of the new config?

[Sharu95]

Hi @BohdanPetryshyn, happy to contribute!

Still just a draft PR but I wanted to put it out there so its easier to iterate on it with feedback. Currently not perfectly parsing from config, but the setup works. Tags are passed from CLI options as well.

My main motivation was to be able to run basti init --target=<some-target> similar to how it is possible to run basti connect --connection. It makes initialization way easier and the config can just be set once in the config file. I think it is a nice abstraction on top of the CLI command ( and the interactive setup)! 👍🏾 An example config file for reference;

connections:
  basti-production:
    target: my-target
    localPort: 8080

targets:
  my-target:
    rdsCluster: basti-production
    awsProfile: AdministratorAccess
    awsRegion: us-east-1
    bastionSubnet: subnet

If the target is part of the connection setup, it should still be parsed as a connection target, but this setup is more or less to adhere to the init command as well, with the config file 🙌🏾

Another motivation I've had is that we manage some of our RDS resources in terraform. The security group used by basti/bastion instance is often deleted during terraform deployments/applies, because its not tracked in terraform, so we end up running basti init more often than ideal if we use terraform a lot