Use JRE, not JDK in production dockerfile

[fm3]

Reduces image size from ~630M to ~530M. I don’t think we need any JDK features in production.

Other large and only barely used dependencies include git and nodejs. We might want to consider getting rid of them to further reduce image download sizes.

URL of deployed dev instance (used for testing):

• https://dockerjre.webknossos.xyz

Steps to test:

• Test image loading, annotating

[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: ac14f16d-4319-4004-9929-24791bfd2b6d

📥 Commits

Reviewing files that changed from the base of the PR and between 3f3bb60 and 6cb1391.

📒 Files selected for processing (3)

• .github/Dockerfile.datastore
• .github/Dockerfile.tracingstore
• .github/Dockerfile.webknossos

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📝 Walkthrough

Walkthrough

Three Dockerfiles updated to use JRE-specific base image variants. Changed eclipse-temurin:21-jammy to eclipse-temurin:21-jre-jammy across datastore, tracingstore, and webknossos configurations. No alterations to build logic or runtime behavior.

Changes

Cohort / File(s)	Summary
Base Image Updates .github/Dockerfile.datastore, .github/Dockerfile.tracingstore, .github/Dockerfile.webknossos	Updated base image from eclipse-temurin:21-jammy to eclipse-temurin:21-jre-jammy across all three Dockerfiles, switching from JDK to JRE-only variant.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 A hop, a skip, we trim the fat,
From JDK down to JRE—imagine that!
Three containers lean and light,
Runtime-only, compact and bright,
No JDK tools slowing our flight! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Use JRE, not JDK in production dockerfile' clearly and concisely describes the main change: switching from JDK to JRE in production Dockerfiles.
Description check	✅ Passed	The description is directly related to the changeset, explaining the rationale (reducing image size from 630M to 530M) and testing approach for the JRE migration.
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 docker-jre

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