Simplify and secure all Oracle Database images

[PhilippSalvisberg]

Create new images with the following changes:

• Combine software and database image (to improve build time the download end unzip should happen before, provide a shell script for that step)
• Tag should reflect version inclusive RU, e.g. 19.19
• Tag name should include the platform if it is not an AMD-image, e.g. 19.19-arm
• Only the very latest PSU/RU per version should be considered (no image for 19.3 .. 19.20 for AMD as starting point)
• Move processing from shell script to Dockerfile (to reduce the final size a squash can be applied, if the size becomes an issue)
• Add USER command in Dockerfile to run a container by default as oracle (54321:54321) instead of root
• Install Oracle example schemas (pre 23c versions) inkl. user SCOTT
• Do not install the following (can be installed separately or provided as dedicated image (APEX/ORDS)):
  • non-Oracle components (oddgen, FTLDB, tePLSQL)
  • APEX
  • Do not install ORDS