Fixes#1550 - Docker builds were broken after PR #1535 switched from
vendored GPAC to system GPAC.
Changes:
- Switch from Alpine to Debian Bookworm (Alpine's musl libc has issues
with Rust bindgen's libclang dynamic loading)
- Support three build variants via BUILD_TYPE argument:
- minimal: No OCR support
- ocr (default): Tesseract OCR for bitmap subtitles
- hardsubx: OCR + FFmpeg for burned-in subtitle extraction
- Support dual source modes via USE_LOCAL_SOURCE argument:
- 0 (default): Clone from GitHub (standalone Dockerfile)
- 1: Use local source (faster for developers)
- Add .dockerignore to exclude build artifacts (~2.7GB -> ~900KB context)
- Update README.md with comprehensive build instructions
Tested all three variants successfully:
- minimal: ~130MB image
- ocr: ~215MB image
- hardsubx: ~610MB image
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
