build: Add workdir option for the default registration of Windows service

[cosmo0920]

The default value of workdir when running as WIndows Service is C:\Windows\System32.
However, the installed position of Fluent Bit should be differed.
By default, it'll be C:\Program Files\fluent-bit.
So, we need to refer it with --workdir option on a Windows installer of Fluent Bit.

After applying this change, the property of Fluent Bit on Windows service will be handled with the following added parameter:

Closes #11116.

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Testing
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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

• Bug Fixes
  • Improved Windows service installation by configuring the working directory for Fluent Bit service startup on Windows systems.

[coderabbitai]

Note

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Walkthrough

The Wix installer template for Fluent Bit's Windows service creation was updated to include a working directory parameter. The sc.exe create command now specifies --workdir "[INSTALL_ROOT]conf" in the CustomAction SetCreateFluentBitWinSvcCommand to define the service's working directory.

Changes

Cohort / File(s)	Summary
Windows Service Configuration cpack/wix/WIX.template.in.cmakein	Added --workdir "[INSTALL_ROOT]conf" parameter to the CustomAction SetCreateFluentBitWinSvcCommand that invokes sc.exe for Windows service creation

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~5–10 minutes

• Review the working directory path to ensure it references the correct installation directory
• Verify that the conf directory exists at that location post-installation
• Confirm the parameter syntax is compatible with the Fluent Bit service wrapper

Poem

🐰 A workdir path so fine and true,
The rabbit hops through config anew,
Windows services now know their place,
With conf in sight, they'll run with grace! ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding a workdir option for Windows service registration in the build system.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch cosmo0920-setup-workdir-as-install-root

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