Migrated Docker base from Ubuntu (eclipse-temurin:11-jre-noble) to Alpine Linux 3.22, achieving 57.9% image size reduction (1.305GB → 549.8MB) while maintaining full functionality.

Infrastructure

• Base image: eclipse-temurin:11-jre-noble → alpine:3.22
• Multi-architecture: Added support for linux/amd64 and linux/arm64 via BuildKit
• Multi-stage build: Optimized 3-stage build (base → intermediate-builder → final)

Size Optimization

• Python cleanup: Removed __pycache__, *.pyc, *.pyo files
• Babel locales: 31.4MB → 640KB (kept only en_* and root.dat)
• Test directories: Removed tests/ and testing/ from site-packages
• Build tools: Removed pip/setuptools from final image
• Layer optimization: Moved curl to build-only stage, used --chown on COPY

Multi-Architecture Support

• amd64: Official coursier musl static build (v2.1.24)
• arm64: VirtusLab coursier glibc build (v2.1.24) with gcompat layer
• Conditional glibc: ARM64 requires glibc for coursier compatibility

Build Improvements

• Virtual build dependencies pattern (gcc, g++, musl-dev cleaned after use)
• Enhanced .dockerignore to exclude dev artifacts
• Environment variable for coursier version (COURSIER_VERSION=2.1.24)

Results