add Prettier step to check formatting

.github/workflows/test.yml

@@ -96,3 +96,11 @@ jobs:
 
       - name: Test Dynamic Build
         run: nix develop -c zig build -Dstatic=false
+
+  prettier:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4 # Check out repo so we can lint it
+      - uses: actionsx/prettier@v3
+        with:
+          args: --check .