add amd64 build target (#99)

Author: paulojblack

.github/workflows/release.yaml

@@ -65,7 +65,7 @@ jobs:
       matrix:
         go-version: [1.23.0]
         os: [darwin]
-        arch: [arm64]
+        arch: [arm64, amd64]
 
     steps:
       - name: Checkout code