fix: add zlib-static to Dockerfile for static linking

Static linking with -lz requires the zlib-static Alpine package
in addition to zlib-dev.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: steinbeck

Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine:3.21 AS builder
 
-RUN apk add --no-cache build-base curl zlib-dev
+RUN apk add --no-cache build-base curl zlib-dev zlib-static
 
 WORKDIR /build