[#288] Updated to Docker Compose V5

[StevenWalker98]

Closes #288

Changes

• Bumped Docker Compose from 2.40.3 to 5.0.2
• Updated Dockerfile comment (V2 → V5)
• Updated goss version check to match V5 output

Context

Docker Compose V5 ("Mont Blanc") was released Dec 2025. Key changes:

• Internal builder removed, build delegated to Docker Bake
• Compose can now be used as an SDK
• Version numbering jumped from 2.x → 5.x to avoid confusion with legacy docker-compose file format versions (2.x/3.x)

Summary by CodeRabbit

• Chores
  • Upgraded Docker Compose to version 5.0.2 (from version 2.40.3)
  • Updated Docker environment configuration and test validation to reflect the new version

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

This pull request updates Docker Compose from version 2.40.3 to 5.0.2 in the Dockerfile and adjusts the corresponding version expectation in goss.yaml. The installation process remains consistent with the V5 plugin-based architecture.

Changes

Cohort / File(s)	Summary
Docker Compose Version Bump Dockerfile, goss.yaml	Updated Docker Compose from V2 (2.40.3) to V5 (5.0.2). Modified installation comments, version values, and version verification command in Dockerfile. Updated expected version test in goss.yaml from v2 to v5.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Split Docker and Docker compose install. #209: Modifies the Dockerfile's Docker Compose installation and verification flow, affecting the same installation/verification commands.
• Improved image size. #203: Updates Docker Compose version handling in both Dockerfile and goss.yaml, potentially conflicting with or building upon these version changes.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title '[#288] Updated to Docker Compose V5' directly and clearly summarizes the main change: upgrading Docker Compose to V5.
Linked Issues check	✅ Passed	The PR updates Docker Compose from 2.40.3 to 5.0.2 with matching test changes, fulfilling the core requirement of issue #288 to upgrade to Docker Compose V5.
Out of Scope Changes check	✅ Passed	All changes are directly related to upgrading Docker Compose from V2 to V5: Dockerfile version bump, comment update, and goss.yaml version verification test.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/288-docker-compose-v5

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