Fix code Dockerfile

[teenager-ETH]

Pull Request Title: Fix code Dockerfile

Summary

This pull request addresses a minor fix in the Dockerfile for Prometheus automation. It enhances the cleanup process after package installation to reduce the image size and improve security.

Changes

• Updated the RUN command to include apt-get clean and removal of /var/lib/apt/lists/*.
• Added additional cleanup steps to optimize the Docker image.

Modified Files

• automation/services/prometheus/Dockerfile

Diff Summary

-    dumb-init
+    dumb-init && \
+    apt-get clean && rm -rf /var/lib/apt/lists/*