fix: install libvips to /opt prefix so libs resolve at runtime (#6)

The previous Dockerfile installed to /usr/local, then tried to copy
libvips.so.42 to /opt/lib. But ldd couldn't resolve it because
/usr/local/lib64 (where AL2023 places it) wasn't in the linker cache.

Fix: use --prefix=/opt --libdir=/opt/lib so libvips installs directly
where the runtime wrapper expects it. Register /opt/lib with ldconfig
before collecting system deps so ldd resolves all transitive libraries.

feat: add gzip layer

feat: add the full list of layers to the release builds

fix(uuid): add missing libuuid dependency

fix: fix layers zip packages directory tree

feat: add multi-arch build support and GitHub Release workflow

- All build scripts now support ARCH env var (arm64/x86_64)
- Replace public.ecr.aws base images with amazonlinux:2023
- Add GitHub Actions workflow to build and release layer zips
- Add jq Dockerfile (was missing)
- Standardize build script pattern across all layers