CI: fix test path

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
         run: |
           sudo apt install xz-utils
           sudo sh -c 'wget -c https://ziglang.org/builds/zig-linux-x86_64-0.9.0-dev.347+628f490c5.tar.xz -O - | tar -xJ --strip-components=1 -C /usr/local/bin'
-      - name: engine::test
-        run: cd engine && zig build test
+      - name: mach::test
+        run: zig build test
       - name: webgpu::test
         run: cd webgpu && zig build test