Update documentation for postgresql to use v18

[Oscmage]

Description

What problem is being solved?

Updating the documentation to Postgres 18

References

Depends on PR https://github.com/openfga/openfga/pull/2722/files

Review Checklist

• [x] I have clicked on "allow edits by maintainers".
• [x] I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• [x] The correct base branch is being used, if not main
• [x] I have added tests to validate that the change in functionality is working as expected

Summary by CodeRabbit

• Documentation
  • Updated Docker setup instructions to use PostgreSQL 18 for the database service.
  • Ensures users pulling the latest images have a consistent, up-to-date environment when running via Docker Compose.
  • No changes to application behavior; guidance only.
  • If you rely on a specific PostgreSQL version, review your local setup before upgrading to avoid unexpected differences in development environments.

[coderabbitai[bot]]

Walkthrough

Updated a documentation page to change the Docker Compose Postgres image tag from postgres:17 to postgres:18 in the OpenFGA setup guide. No other files or logic were modified.

Changes

Cohort / File(s)	Summary of Changes
Docs: Docker setup docs/content/getting-started/setup-openfga/docker-setup.mdx	Updated Docker Compose snippet to reference postgres:18 instead of postgres:17.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title succinctly conveys the primary change of the pull request, namely updating the documentation to use PostgreSQL version 18, and directly reflects the modifications made in the Docker setup guide.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between db0dd24b238d9a5157709729a193552564af93b9 and a4dd56bfd1d00532841e197e9aef8a1f3b3c1df2.

📒 Files selected for processing (1)

• docs/content/getting-started/setup-openfga/docker-setup.mdx (1 hunks)

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