Upgrade Zig to 0.15.2

[andy1li]

Upgrade Zig to 0.15.2

---

Note

Upgrade Zig to 0.15.2 across configs and add a Dockerfile to build with caching.

• Build/Tooling:
  • Upgrade Zig version from zig-0.15 to zig-0.15.2 in compiled_starters/zig/codecrafters.yml and solutions/zig/01-gg4/code/codecrafters.yml.
  • Add dockerfiles/zig-0.15.2.Dockerfile to install Zig 0.15.2, set PATH and dependency env, run .codecrafters/compile.sh, and cache .zig-cache.

^{Written by Cursor Bugbot for commit 3874ba1. This will update automatically on new commits. Configure here.}

[cursor]

Bug: Missing Curl Causes Build Failure

The Dockerfile uses curl to download the Zig tarball on line 10, but curl is not installed in the image. The apt-get install command on lines 4-5 only installs xz-utils, and the debian:bookworm base image does not include curl by default. This will cause the Docker build to fail with a "curl: command not found" error. The curl package needs to be added to the apt-get install command.