Added Docker secret support.

[mooseh]

Summary of work

• added secret overrides when secret files exist
• updated README
• added break-system-packages to pip install command due to it failing.

[Copilot]

Pull request overview

Adds support for sourcing Steam credentials from Docker secrets at runtime, along with documentation updates and a Docker build tweak to allow pip installs on Debian Bookworm.

Changes:

• Read /var/run/secrets/STEAM_USER and /var/run/secrets/STEAM_PASSWORD (when present) and apply them during container startup.
• Document Docker secrets usage with a docker-compose example in the README.
• Add --break-system-packages to the Dockerfile pip install step to avoid build failures.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
launch.py	Adds Docker secrets file reads to override Steam credentials at startup.
README.md	Documents Docker secrets support and provides a compose snippet.
Dockerfile	Adjusts pip install command to work with Debian’s externally-managed Python environment.

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