feat: containerize linux-sysmonitor health-check script

[PuneethM-06]

Summary

Containerized the linux-sysmonitor health-check script to provide a consistent and portable execution environment using Docker.

Changes

• Added a Dockerfile to package the application.
• Used debian:bookworm-slim as the base image and documented the rationale.
• Installed the required runtime dependencies (bash, procps, iputils-ping, and iproute2).
• Configured /app as the working directory.
• Copied the project into the container image.
• Made health-check.sh executable.
• Configured the container to execute health-check.sh using ENTRYPOINT.

Validation

• Successfully built the Docker image.
• Successfully started the container using the configured entrypoint.
• Runtime compatibility issues related to environment-specific command behavior (top output parsing and journalctl) were identified during validation and will be addressed in a follow-up bug fix PR.