fix: make use of config.toml, implement config_path as argument

[sebasti810]

Changes

1. Configuration Prioritization (make really use of it):

• Command-line arguments take the highest priority.
• If not provided, values are sourced from the config.toml file.
• Any missing values are filled with default values.

2. Custom Configuration Path:

• A custom path for the config.toml file can now be specified via a command-line argument.
• By default, the configuration file is expected at ./deimos/config.toml.

3. Automatic Configuration File Creation:

• If the config.toml file does not exist at the specified/default path, it will be automatically created with the current default values.

4. Partial Configuration:

• It is now possible to define only a subset of configuration parameters in the config.toml file.
• Any unspecified parameters will "fall back" to their default values.

@distractedm1nd TODO: Readme / example config.toml? Or not necessary because of the automatic creation of the default one

[coderabbitai]

Walkthrough

This update introduces configuration management enhancements to the codebase, including the addition of toml and dirs dependencies, making the log_level an optional field, and refining the configuration loading and merging processes. Several structs were updated with serialization traits, and both error handling and initialization procedures were refined.

Changes

File	Change Summary
Cargo.toml	Added toml and dirs dependencies.
src/cfg.rs	Enhanced configuration handling: added ConfigError, updated struct serialization, and improved initialization logic.
src/main.rs	Modified environment variable setting for log_level.
src/node_types.rs	Updated error handling and logging formats for LightClient and Sequencer.

Sequence Diagram(s)

The changes are too varied and minor in terms of control flow to warrant the generation of meaningful sequence diagrams.

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Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between af8739b and fa12d8e.

Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

Files selected for processing (2)

• Cargo.toml (1 hunks)
• src/cfg.rs (7 hunks)

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

• Cargo.toml
• src/cfg.rs

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[coderabbitai]

Actionable comments posted: 2