dockefile: Install libxxhash0 on builder image

[cosmo0920]

Debian trixie has libxxhash 0.8.3-2. So, we can use it on the building process of production image.

Closes #11978.

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Testing
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• Example configuration file for the change
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• Attached Valgrind output that shows no leaks or memory corruption was found

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• Run local packaging test showing all targets (including any new ones) build.
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Documentation

• Documentation required for this feature

Backporting

• Backport to latest stable release.

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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
  • Updated Docker build configuration to include an additional system dependency.

[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: c58bdccc-b966-4a1a-af3e-490830578c8d

📥 Commits

Reviewing files that changed from the base of the PR and between 02c2f4b and 6cfe828.

📒 Files selected for processing (1)

• dockerfiles/Dockerfile

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📝 Walkthrough

Walkthrough

The deb-extractor stage in dockerfiles/Dockerfile gains libxxhash0 in its apt-get download package list. This adds the libxxhash.so.0 shared library to the extracted /dpkg/ directory included in production images.

Changes

Dockerfile deb-extractor dependency fix

Layer / File(s)	Summary
Add libxxhash0 to deb-extractor download list dockerfiles/Dockerfile	libxxhash0 is appended to the apt-get download package list in the deb-extractor stage so that libxxhash.so.0 is extracted into /dpkg/ alongside liblz4-1.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• fluent/fluent-bit#11006: Modifies the same deb-extractor stage's apt-get download package list in dockerfiles/Dockerfile, directly adjacent to this change.

Suggested reviewers

• niedbalski

Poem

🐇 A tiny lib was lost and unfound,
libxxhash0 nowhere around,
LZ4 fields went silently dark,
One line added — a small but bright spark,
Now journals flow without a bound! 🎉

🚥 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 accurately describes the main change: adding libxxhash0 to the builder image Dockerfile, which directly addresses the PR's primary objective.
Linked Issues check	✅ Passed	The code change adds libxxhash0 to the deb-extractor stage, directly resolving issue #11978's root cause of missing libxxhash.so.0 dependency in production images.
Out of Scope Changes check	✅ Passed	The change is narrowly scoped to adding libxxhash0 dependency in the Dockerfile, with no unrelated modifications present.
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
• Commit unit tests in branch cosmo0920-fill-missing-xxhash-shared-object

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