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.

[gayathrii12]

1)Rename dockerfile to Dockerfile, so the usual docker build . command works without extra options.

2)Add README instructions for building and running the container.

3)The health-check script currently has known incompatibilities with top and journalctl inside the container. Since these are part of the health check, please fix them or clearly document the limitation before merge.

4)Please document that the container monitors its own isolated environment, rather than the Docker host. If host monitoring is the goal, the container will need additional mounts/configuration to access host system information.

[PuneethM-06]

The health-check script currently has known incompatibilities with top and journalctl inside the container. Since these are part of the health check, please fix them or clearly document the limitation before merge.

• This is been tracked by a seprate ticket. Will update once the ticket is resolved