Document first user configuration file usage

[igorpecovnik]

Added information about the first user configuration file and its functionality.

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[coderabbitai]

Walkthrough

This change adds a new documentation subsection titled "User provided first config" to the Developer Guide. The subsection describes the handling of the userpatches/firstboot.conf configuration file, including its location, the conditions that trigger its use, and the resulting behavior (displaying an informational alert and applying the first configuration).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• Documentation-only change: No code logic, functionality, or exported declarations are affected
• Single file modification: Only docs/Developer-Guide_User-Configurations.md is altered
• Minimal scope: Simple descriptive text addition within an existing document structure

Areas to review:

• Accuracy of the feature description against actual implementation
• Consistency with existing documentation formatting and terminology
• Clarity and completeness of the path, trigger, and effect descriptions

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and clearly describes the main change: adding documentation about first user configuration file usage.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The pull request description accurately relates to the changeset, which adds documentation about the first user configuration file.

✨ 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 igorpecovnik-patch-3

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

docs/Developer-Guide_User-Configurations.md (1)

16-20: Consider adding inline format hints and an example preset key to improve developer usability.

The referenced link (docs.armbian.com/User-Guide_Autoconfig) is comprehensive and covers the full directive list and format specifications. However, developers reading this section would benefit from a brief inline example showing the shell-style format and a few common preset keys (e.g., PRESET_ROOT_PASSWORD, PRESET_LOCALE) before directing them to the full docs.

The current section is complete as-is, but adding 2–3 lines with format and example usage would improve discoverability and save developers a click.

📜 Review details

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Plan: Pro

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📥 Commits

Reviewing files that changed from the base of the PR and between 7263b2c and 80be236.

📒 Files selected for processing (1)

• docs/Developer-Guide_User-Configurations.md (1 hunks)