chore(log-levels): Refactor log level env flag

[zacharyblasczyk]

Summary by CodeRabbit

• New Features
  • Added log-level configuration support via command-line flag and environment variable (CTRLPLANE_LOG_LEVEL).
  • Supports debug, info, warn, and error logging levels with "info" as the default.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request introduces Viper-based configuration management for the log-level flag, binding a persistent flag to the CTRLPLANE_LOG_LEVEL environment variable and retrieving the value via viper.GetString() in the root command's initialization hook. The refactoring replaces the dynamic defaultOrEnv helper function with a fixed "info" default.

Changes

Cohort / File(s)	Summary
Log-level Configuration via Viper cmd/ctrlc/ctrlc.go, cmd/ctrlc/root/root.go	Integrates Viper for centralized log-level configuration, binding the persistent flag to CTRLPLANE_LOG_LEVEL environment variable. Replaces dynamic default resolution via defaultOrEnv helper with fixed "info" default and viper.GetString() retrieval. Removes os import and defaultOrEnv helper function from root.go.

Estimated Code Review Effort

🎯 2 (Simple) | ⏱️ ~15 minutes

Possibly Related PRs

• chore: debug logging & env var for log level #45: Directly related configuration change for log-level flag initialization in cmd/ctrlc/root/root.go using an alternative approach (defaultOrEnv helper vs. Viper integration).

Poem

🐰 A flag once wild, now Viper-bound,
CTRLPLANE_LOG_LEVEL found!
From env to config, a cleaner way,
Log levels dancing through the day. ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'chore(log-levels): Refactor log level env flag' accurately describes the main change: refactoring log level environment variable handling by introducing Viper configuration and replacing the defaultOrEnv helper.
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 docstrings

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