Fix Docker runtime healthcheck by including wget in final image

[Copilot]

Docker marked iptv-proxy unhealthy even when the app was running because the healthcheck script invoked wget, which was not present in the runtime image. This PR resolves the dependency mismatch without changing healthcheck behavior.

• Runtime image dependency alignment

  • Updated the final-stage package install in Dockerfile to include wget alongside ffmpeg.
  • Keeps the existing /usr/src/app/healthcheck.sh contract intact (wget --spider http://localhost:34400/health).

• Scope

  • No changes to application logic, routes, or healthcheck script behavior.
  • Fix is limited to container runtime packaging.

RUN apt-get update && \
    apt-get install -y --no-install-recommends ffmpeg wget && \
    rm -rf /var/lib/apt/lists/*

[cbulock]

No code-level issues found.

The change directly fixes the observed runtime failure: the container healthcheck calls wget, and the final image now installs wget alongside ffmpeg while preserving the existing healthcheck script and endpoint behavior.

One validation caveat before merging: the CI run for the current head SHA is currently action_required, so the Docker build/CI has not completed yet. I’d let CI run before merging.

[Copilot]

Pull request overview

This PR fixes a runtime/container packaging issue where the Docker healthcheck script depends on wget, but wget was not installed in the final production image—causing the container to be marked unhealthy even when the app was running.

Changes:

• Install wget alongside ffmpeg in the final Docker image stage to satisfy /usr/src/app/healthcheck.sh.
• Keep the existing healthcheck script and health endpoint contract unchanged.