fix GHA pipeline

Signed-off-by: Avi Deitcher <avi@deitcher.net>

Author: deitch

.github/workflows/ci.yaml

@@ -26,8 +26,6 @@ jobs:
   build:
     strategy:
         matrix:
-          arch: [amd64, arm64, riscv64]
-          os: [linux, darwin]
           include: 
             - arch: amd64
               os: linux
@@ -40,7 +38,7 @@ jobs:
             - arch: arm64
               os: darwin
 
-      runs-on: ubuntu-latest
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v4