Fix #76: Improve minio_mc connectivity by updating MinIO healthcheck

[younesious]

Why I'm doing:

Fixes issue #76 — the routine load quickstart docker-compose.yml fails on macOS because minio_mc cannot connect to the MinIO container due to an incorrect or unavailable healthcheck method.

What I'm doing:

• Replaced the old healthcheck that used mc ready, which doesn't exist inside minio/minio
• Added a proper HTTP-based healthcheck using /minio/health/live
• Adjusted the minio_mc service to wait until mc alias set succeeds

Fixes:

#76

What type of PR is this:

• BugFix

Does this PR entail a change in behavior?

• No, this PR will not result in a change in behavior.

Checklist:

• The modified docker-compose works correctly on macOS
• The PR improves cross-platform compatibility
• No core StarRocks logic is changed

[CLAassistant]

All committers have signed the CLA.

[DanRoscigno]

Thanks so much @younesious !