Fix optional dependency check for better-sqlite3

[acburdine]

once the next version of Ghost is released, this'll need to be merged in order to fix the optional dep assertion (next version of Ghost will use better-sqlite3 instead of sqlite3)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 2d7d7a02-dfeb-4647-ade3-7626a5e5f4d3

📥 Commits

Reviewing files that changed from the base of the PR and between d0339e6 and d31e721.

📒 Files selected for processing (3)

• 6/alpine3.23/Dockerfile
• 6/bookworm/Dockerfile
• Dockerfile.template

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Walkthrough

The build-time dependency verification commands in three Dockerfiles (alpine3.23, bookworm, and Dockerfile.template) were updated to check for better-sqlite3 instead of sqlite3. The existing check that verifies @tryghost/image-transform can transform files (and throws if sharp isn't installed) remains unchanged in all three files.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Sequence Diagram(s)

Not applicable — this change is a simple, repetitive one-line substitution across three files with no control flow changes.

Related issues: None referenced in the provided context.

Related PRs: None referenced in the provided context.

Suggested labels: dependencies, docker

Suggested reviewers: None specified.

Poem:
A rabbit hopped through Docker's den,
Swapped sqlite3 for its cousin again,
Better-sqlite3 now takes the stage,
Sharp still checks each transformed page,
Three files updated, tidy and neat—
A build-time tweak, small but complete! 🐰

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: updating the optional dependency check to use better-sqlite3.
Description check	✅ Passed	The description is directly related to the change and explains the Ghost dependency switch prompting this update.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/better-sqlite3

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