According to the issue, `.sbtopts` entries are appended after
CLI args in sbt 1.12.x, so `.sbtopts` JVM memory settings (e.g., `-Xmx2g`) override CLI `--mem`,
causing invalid JVM settings.
- Replace 'eval echo $line' with 'printf "%s\n" "$line"' in loadConfigFile()
- Prevents shell expansion of special characters like |, *, &, etc.
- Fixes issue where properties with pipes, wildcards, and ampersands
caused 'command not found' or 'unexpected' errors
- Add test to verify special characters are handled correctly on all platforms
- Change from prepend to append for machine/dist sbtopts
- Change project .sbtopts from prepend to append so it appears last
- Project-level .sbtopts now correctly overrides machine-wide configs
- Add integration tests to verify sbtopts priority order
- Extend testOutput to support dist and machine sbtopts testing
- Copy staging directory to temp location to avoid modifying staging dir