Fix cta-build pod failing on machines <8GB RAM

Summary

While setting up the dev environment with a m2.large machine (8GB of RAM) the build pod fails. https://gitlab.cern.ch/cta/CTA/-/blame/main/continuousintegration/orchestration/pods/pod-build-alma9.yml?ref_type=heads#L17

For a build process we should be using as many resources as possible, no limits. Why are we setting these limits?