ci: install Zig in publish workflow

Author: simonklee

.github/workflows/publish.yml

@@ -5,6 +5,9 @@ on:
     tags:
       - "v*"
 
+env:
+  ZIG_VERSION: 0.15.2
+
 jobs:
   publish:
     runs-on: ubuntu-latest
@@ -14,6 +17,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: oven-sh/setup-bun@v2
+      - uses: goto-bus-stop/setup-zig@v2
+        with:
+          version: ${{ env.ZIG_VERSION }}
 
       - name: Verify version matches tag
         run: |