packaging: add support for Ubuntu 26.04

[patrick-stephens]

Adds support for latest Ubuntu 26.04 LTS version (resolute).

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Testing
Before we can approve your change; please submit the following in a comment:

• Example configuration file for the change
• Debug log output from testing the change

• Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• Run local packaging test showing all targets (including any new ones) build.
• Set ok-package-test label to test for all targets (requires maintainer to do).

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
  • Added build support for Ubuntu 26.04 on standard and ARM64 architectures.
  • Updated build infrastructure to include Ubuntu 26.04 compilation environments.
  • Extended repository management to include the new Ubuntu distribution path.

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds Ubuntu 26.04 support across the Fluent Bit packaging infrastructure by registering new build targets, providing Docker build stages for both x86_64 and ARM64v8 architectures, and configuring repository publishing for the resulting Debian packages.

Changes

Ubuntu 26.04 build and packaging support

Layer / File(s)	Summary
Build target configuration packaging/build-config.json	Two new Debian targets for ubuntu/26.04 and ubuntu/26.04.arm64v8 are registered in the linux_targets list.
Docker build stages for Ubuntu 26.04 packaging/distros/ubuntu/Dockerfile	Standard and ARM64v8 Docker build stages install build dependencies, download/extract the configured CMake version into /opt/cmake, and update PATH; the ARM64 stage adds qemu-aarch64-static for cross-architecture emulation.
Repository configuration for Ubuntu 26.04 packaging/update-repos.sh	The ubuntu/resolute repository path is added to the Debian repository paths array so the apt repository update script processes and publishes Ubuntu 26.04 packages.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• fluent/fluent-bit#10728: Extends packaging/update-repos.sh's DEB_REPO_PATHS array by adding a new Debian repository target, a closely related packaging change.

Suggested reviewers

• niedbalski
• celalettin1286

Poem

🐰 A noble leap to twenty-six,
Ubuntu's newest time to mix,
With Docker stages, config spins,
ARM and x86, the build begins,
Let packages hop into repos bright!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and clearly describes the main objective of the pull request: adding Ubuntu 26.04 support to the packaging system. All changes (build config, Dockerfile, and update-repos script) center on this primary goal.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch packaging_add_ubuntu_26_04

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 0e63274eec

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packaging/distros/ubuntu/Dockerfile`:
- Around line 260-282: The Dockerfile stage labeled ubuntu-26.04-base is using
the wrong base image (FROM ubuntu:24.04); update the FROM line for the
ubuntu-26.04-base stage to use the correct ubuntu:26.04 image so the stage name,
comment, and package metadata match the intended distribution. Ensure the change
is made where the stage label ubuntu-26.04-base is declared (near the existing
ARG CMAKE_VERSION/CMAKE_HOME block) and keep the rest of the RUN/install steps
unchanged.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4d77e71e-22e1-4758-9f4d-66b4ead64cfa

📥 Commits

Reviewing files that changed from the base of the PR and between 811b5ef and 0e63274.

📒 Files selected for processing (3)

• packaging/build-config.json
• packaging/distros/ubuntu/Dockerfile
• packaging/update-repos.sh

[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packaging/distros/ubuntu/Dockerfile`:
- Line 280: Remove the insecure curl -k option from the CMake download commands
so TLS certificate validation is enforced; update the two curl invocations that
reference "${cmake_download_url}" and extract into "${CMAKE_HOME}" (the lines
using curl -jksSL "${cmake_download_url}" | tar ...) to drop the -k flag (i.e.,
use -jsSL or equivalent) in both occurrences.
- Around line 269-280: The ubuntu-26.04-base and ubuntu-26.04.arm64v8-base
Docker stages run piped commands (e.g., the curl | tar pipeline that uses
CMAKE_HOME and CMAKE_VERSION) but lack a SHELL directive enabling pipefail; add
a SHELL directive for those two stages to run bash with pipefail enabled so that
failures in the curl | tar pipeline (and any other piped commands) surface and
cause the build to fail.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1b1b2a3f-83c1-4fa7-a5dd-b191bbd78b31

📥 Commits

Reviewing files that changed from the base of the PR and between 0e63274 and 336d62d.

📒 Files selected for processing (3)

• packaging/build-config.json
• packaging/distros/ubuntu/Dockerfile
• packaging/update-repos.sh

🚧 Files skipped from review as they are similar to previous changes (2)

• packaging/update-repos.sh
• packaging/build-config.json

[patrick-stephens]

@celalettin1286 / @niedbalski can you approve so can merge? Pretty straightforward I hope!