add support for zig 0.15

compiled_starters/zig/build.zig

@@ -4,9 +4,11 @@ const std = @import("std");
 pub fn build(b: *std.Build) void {
     const exe = b.addExecutable(.{
         .name = "main",
-        .root_source_file = b.path("src/main.zig"),
-        .target = b.standardTargetOptions(.{}),
-        .optimize = b.standardOptimizeOption(.{}),
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("src/main.zig"),
+            .target = b.standardTargetOptions(.{}),
+            .optimize = b.standardOptimizeOption(.{}),
+        }),
     });
 
     // This declares intent for the executable to be installed into the

compiled_starters/zig/build.zig.zon

@@ -9,7 +9,7 @@
     // This field is optional.
     // This is currently advisory only; Zig does not yet do anything
     // with this value.
-    .minimum_zig_version = "0.14.0",
+    .minimum_zig_version = "0.15.1",
 
     // This field is optional.
     // Each dependency must either provide a `url` and `hash`, or a `path`.

compiled_starters/zig/codecrafters.yml

@@ -8,4 +8,4 @@ debug: false
 # on Codecrafters.
 #
 # Available versions: zig-0.14
-buildpack: zig-0.14
+buildpack: zig-0.15

dockerfiles/zig-0.15.Dockerfile

@@ -0,0 +1,27 @@
+# syntax=docker/dockerfile:1.7-labs
+FROM alpine:3.20
+
+RUN apk add --no-cache 'xz>=5.6' 'curl>=8.9'
+
+# Download and install Zig
+RUN curl -O https://ziglang.org/download/0.15.1/zig-linux-x86_64-0.15.1.tar.xz \
+    && tar -xf zig-linux-x86_64-0.15.1.tar.xz \
+    && mv zig-linux-x86_64-0.15.1 /usr/local/zig \
+    && rm zig-linux-x86_64-0.15.1.tar.xz
+
+# Add Zig to PATH
+ENV PATH="/usr/local/zig:${PATH}"
+
+ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="build.zig,build.zig.zon"
+
+WORKDIR /app
+
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
+# This runs zig build
+RUN .codecrafters/compile.sh
+
+# Cache build directory
+RUN mkdir -p /app-cached
+RUN mv /app/.zig-cache /app-cached/.zig-cache || true