CHORE: Update docker compose format [skip ci]

[tutte]

This PR reverts the environment variable expansion on the quickstart docker-compose.yml which is meant to be updated during the release process.
It adopted this format in PR #30548

[github-actions]

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[gitar-bot]

Code Review ✅ Approved

Reverts environment variable expansion in the quickstart docker-compose.yml to restore the format expected during release processing. No issues found.

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