Carlos Fernandez 3f45a4e136 fix(docker): Rewrite Dockerfile to fix broken builds ...

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>

2025-12-20 17:27:42 +01:00

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