Support running of apps without rw layer

[astolcenburg]

Ref: #RDKEAPPRT-487

[Copilot]

Pull request overview

This PR adds support for running bolt applications without a read-write overlay layer, providing a more restrictive filesystem environment where only a designated home directory is writable. The changes introduce a new command-line option --rw-overlay that allows users to enable or disable the overlay layer.

Key changes:

• Added --rw-overlay=<true/false> option to control whether apps run with a full read-write overlay or with only a writable home directory
• Moved HOME environment variable from static template to dynamic configuration, changing from /home/root to /home
• Implemented conditional directory setup and mounting based on the rwOverlay option

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
bolt/src/config.cjs	Adds PROCESS_HOME_DIR constant to centralize home directory configuration
bolt/src/runtime-config.cjs	Removes static HOME environment variable from template in favor of dynamic configuration
bolt/src/run.cjs	Implements core logic for rwOverlay option, including conditional directory setup, bind mounting, and option parsing
bolt/src/bolt.cjs	Updates CLI help text to document the new --rw-overlay option
bolt/README.md	Updates documentation to describe the new --rw-overlay option

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