fixup! .github/workflows/ci.yml: exercise 'zig build test'.

Author: dot-asm

.github/workflows/ci.yml

@@ -271,8 +271,13 @@ jobs:
 
     - name: Zig
       run: |
-        base_dir=zig-x86_64-linux-0.15.2
-        curl -sSf https://ziglang.org/download/0.15.2/$base_dir.tar.xz | unxz -c | tar xf -
+        ver=0.15.2
+        base_dir=zig-x86_64-linux-$ver
+        curl -sSf https://ziglang.org/download/$ver/$base_dir.tar.xz | unxz -c | tar xf -
         if [ -x $base_dir/zig ]; then
-            $base_dir/zig build test
+            PATH=$PWD/$base_dir:$PATH
+            zig build test
+            curl https://wasmtime.dev/install.sh -sSf | bash
+            PATH=~/.wasmtime/bin:$PATH
+            zig build test -Dtarget=wasm32-wasi -fwasmtime
         fi