[housekeeping] Include default MinIO credentials in sandbox console readout

[jpvotta]

Motivation: Why do you think this is important?

When following the steps to setup Flyte on a demo sandbox, the console reports that 📂 The Minio API is hosted on localhost:30002. Use http://localhost:30080/minio/login for Minio console. However, in order to view the obect store, you need to use the default credentials for MinIO, which are:

• username: minio
• password: miniostorage

Goal: What should the final outcome look like, ideally?

It would be great to include this information in:

• The docs (sandbox deployment article)
• The console readout upon successful install (part of the Flyte is ready! message)

Describe alternatives you've considered

N/A

Propose: Link/Inline OR Additional context

No response

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[welcome]

Thank you for opening your first issue here! 🛠

[GRomR1]

@jpvotta absolutely agree with you! without this issue I cannot login in Minio Admin.

I've found a place where these output should be added

https://github.com/flyteorg/flytectl/blob/master/pkg/util/util.go#L96

[davidmirror-ops]

@GRomR1 that's great!

would you be up to submitting a PR?