Update Dockerfile for binary build process

[marevol]

Major changes:

• Migrate from EOL CentOS 7 to AlmaLinux 9 (CentOS successor)
• Add OS-specific Dockerfiles for multiple distributions
  • AlmaLinux 9 (RHEL/CentOS compatible)
  • Ubuntu 22.04 LTS (Debian-based)
  • Amazon Linux 2023 (AWS optimized)
  • Alpine Linux (lightweight, musl-based)
• Organize Docker files in dedicated docker/ directory
• Add build-docker.sh script for easy multi-OS builds
• Improve build.sh with better error handling and progress reporting
• Enhance bin/ utility scripts (dwg2txt, dxf2txt, dxf2txt.py)
  • Add comprehensive help messages
  • Improve error handling
  • Add input validation
  • Modernize Python code with better structure
• Update README.md with detailed Docker usage instructions
  • Document all supported OS distributions
  • Add examples for single and multi-OS builds
  • Add utility scripts documentation

Benefits:

• Security: Using actively maintained OS versions
• Flexibility: Build binaries for multiple target platforms
• Usability: Simplified build process with clear documentation
• Maintainability: Better organized Docker configuration

[Copilot]

Pull Request Overview

This PR modernizes the Docker build infrastructure by migrating from end-of-life CentOS 7 to multiple actively maintained Linux distributions. The changes organize Docker configurations into a dedicated directory, add multi-OS build support, and enhance utility scripts with better error handling and documentation.

Key Changes:

• Migration from EOL CentOS 7 to AlmaLinux 9 as the default, with additional support for Ubuntu 22.04 LTS, Amazon Linux 2023, and Alpine Linux
• Introduction of automated multi-OS build script (build-docker.sh) with comprehensive help and error handling
• Enhanced build.sh with structured build steps, progress reporting, and parallel compilation

Reviewed Changes

Copilot reviewed 9 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
docker/build-docker.sh	New automated build script supporting multiple OS distributions with image building, library compilation, and Docker Hub push capabilities
docker/README.md	Documentation for Docker build configurations with usage examples and OS selection guidance
docker/Dockerfile.ubuntu	Ubuntu 22.04 LTS build environment configuration
docker/Dockerfile.amazonlinux	Amazon Linux 2023 build environment configuration
docker/Dockerfile.alpine	Alpine Linux build environment configuration
docker/Dockerfile.almalinux	AlmaLinux 9 build environment configuration (CentOS successor)
build.sh	Enhanced build script with structured steps, progress indicators, and improved error handling
README.md	Updated documentation with multi-OS Docker build instructions and utility scripts usage
Dockerfile	Removed deprecated CentOS 7 Dockerfile

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[Copilot]

The file permissions were changed from 777 (world-writable) to 644 (owner-writable, world-readable). However, this creates a potential issue: the original 777 permissions were overly permissive but ensured the file could be accessed when Docker writes it to the mounted volume. With 644 permissions, if the Docker container runs as a different UID than the host user, the host user may not be able to read or modify the output file. Consider using 666 (rw-rw-rw-) to ensure the host user can access the file while still being more restrictive than 777.

Suggested change

	chmod 644 "${OUTPUT_DIR}/${OUTPUT_FILE}"
	chmod 666 "${OUTPUT_DIR}/${OUTPUT_FILE}"

[Copilot]

The script uses set -e on line 29 but lacks set -u (exit on undefined variable) and set -o pipefail (fail on pipe errors). For a critical build script that handles multiple OS distributions, consider adding these flags for more robust error handling: set -euo pipefail.