Dockerfile: optimize layers

[marcofranssen]

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

• Chores
  • Optimized container build to reduce intermediate layers, yielding faster builds and smaller images.
  • Ensured runtime libraries are present in the production image for reliable operation.
  • Exposed service on port 2020 and moved default startup to the production image for improved accessibility.
  • Reordered debug image build without changing its runtime behavior.

[marcofranssen]

Moved up, as this is not likely to change, meaning the layer doesn't have to be rebuild,pushed,pulled.

[marcofranssen]

Rebased on top of master branch and fixed following small mistake.

UndefinedVar: Usage of undefined variable '$RELEASE_VERSION'
More info: https://docs.docker.com/go/dockerfile/rule/undefined-var/

[github-actions]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[marcofranssen]

I rebased the PR on latest main. Can someone please have a look at this one?

@patrick-stephens what is holding back from getting this one merged?

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2a0afdea-68f3-4bf7-a27b-f136a1f803fd

📥 Commits

Reviewing files that changed from the base of the PR and between e39e92e and 58db9c9.

📒 Files selected for processing (1)

• dockerfiles/Dockerfile

🚧 Files skipped from review as they are similar to previous changes (1)

• dockerfiles/Dockerfile

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📝 Walkthrough

Walkthrough

Refactored dockerfiles/Dockerfile to consolidate build ARG/ENV blocks, chain build/install steps to reduce layers, reorder multi-stage stages (debug/production), add EXPOSE 2020 to production, and ensure libraries/certificates are copied from the deb-extractor stage into production.

Changes

Cohort / File(s)	Summary
Docker build optimization dockerfiles/Dockerfile	Consolidated FLB_NIGHTLY_BUILD/FLB_CHUNK_TRACE and WAMR_BUILD_TARGET/EXTRA_CMAKE_FLAGS ARG/ENV declarations; moved DEBIAN_FRONTEND into builder env; chained make and install into single RUN to reduce layers; reordered debug stage and relocated its CMD; added EXPOSE 2020 and moved ENTRYPOINT/default CMD into production; added COPY --from=deb-extractor /dpkg / after certs to ensure libs present.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Suggested labels

ci/integration-docker-ok

Suggested reviewers

• niedbalski
• celalettin1286
• patrick-stephens

Poem

🐰 Layers trimmed and args entwined,
One build stream now sleek and kind,
Ports exposed and copies made,
Debug hops earlier in the glade,
I nibble changes — neat and spry! 🥕

🚥 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 'Dockerfile: optimize layers' directly and accurately summarizes the main change—reducing build layers in the Dockerfile through various optimizations.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[marcofranssen]

Took another turn rebasing it and resolving the conflicts.