Container Improvements

[saurabhahuja71]

• Mandatory RPM provenance:
  Generates:
  • base-image-rpms.txt — RPMs from the OL base image
  • image-rpms.txt — all RPMs in the final image
  • image-added-rpms.txt — RPMs added beyond the base image
• Base-image provenance:
  • /usr/share/oracle/image-metadata/base-image-chain.json
  • Image labels point to this file.
  • This records the base-image name and digest separately from the RPM inventory.
• Modern image layout:
  • Versions >=19.3.0 use containerfiles//Containerfile.
  • Older versions continue using dockerfiles//Dockerfile.
  • Build scripts select the correct layout conditionally.
• Container runtime updates:
  • RAC, CMAN, GDD/GSM build wrappers prefer Podman.
  • Docker remains available as a fallback when Podman is not installed.
• Environment setup updates:
  • RAC, CMAN, and GSM setup scripts run dnf update -y.
  • DNF metadata and package caches are cleaned after the update.
• Documentation updates:
  • RAC and CMAN OL8/OL9/ARM requirements.
  • RU requirements and patch 34436514.
  • Explicit UEKR and kernel requirements.
  • Clarification that the 19.3.0 image is a build base and deployment requires the documented patched GI and Database homes.
  • RPM and base-image metadata inspection commands.