Fix ARM64 emulation support in all entrypoints

[fank]

Summary

• Fixes ARM64 emulation support for scenario.sh and scenario2map.sh entrypoints
• Creates shared setup-exec.sh script to handle ARM64 emulation logic consistently
• Refactors existing entrypoints to use the shared emulation setup
• Ensures all factorio binary calls work correctly on ARM64 platforms using box64 emulation

Problem

Issue #585 identified that scenario.sh and scenario2map.sh were not using the ARM64 emulation logic (box64) that was present in docker-entrypoint.sh. This caused these entrypoints to fail on ARM64 platforms.

Solution

• Created setup-exec.sh that handles the ARM64 emulation setup
• Updated all entrypoints to use this shared script for consistency:
  • scenario.sh - now supports ARM64 emulation
  • scenario2map.sh - now supports ARM64 emulation
  • docker-entrypoint.sh - refactored to use shared script
  • docker-entrypoint-rootless.sh - refactored to use shared script

Test plan

• Verify all entrypoints source the shared script correctly
• Verify ARM64 emulation logic is consistent across all entrypoints
• Verify existing functionality is preserved for non-ARM64 platforms
• Test on ARM64 platform to confirm box64 emulation works with scenario entrypoints

Files changed

• docker/files/setup-exec.sh - New shared script for ARM64 emulation
• docker/files/scenario.sh - Updated to use shared emulation logic
• docker/files/scenario2map.sh - Updated to use shared emulation logic
• docker/files/docker-entrypoint.sh - Refactored to use shared script
• docker/files/docker-entrypoint-rootless.sh - Refactored to use shared script

Fixes #585

🤖 Generated with Claude Code

[hrshtt]

thank you for this fix!

just to be sure, "${INSTALLED_DIRECTORY}"/docker-dlc.sh is still only part of docker entrypoint so DLC_SPACE_AGE=false will also not be applied for the rest of the entrypoints. the same way EXEC w emulator wasnt being applied.

this will break the other entrypoints for those without space age dlc