fix: RPM adjustments

[takb]

Information about the changes

• Use JRE headless dependency
• Write ENV variables into /etc/.../openrouteservice.conf instead of setenv.sh.
• Turn JWS_HOME into ORS_HOME and use that to control where data is installed
  • Add check if ors_home is set.
  • Use ors_home as the base for data and such things.
• Remove the war-file symlink.
• Logging should go into $ORS_HOME/logs
  • Remove logging variable from SPECS
• Log rotation
  • Set rotation interval to 7 days
• Config is a mix of json / yaml because we branched off at a place where config overhaul was incomplete.
  • Adjust example config
• Adapt the GitHub workflow to test in a better suited environment (optional for the next cycle)
• Adapt documentation
• Set xmx and xms to max system memory - 4Gb.