Reduce build-and-test.yml to Windows-only, Python 3.12 only.

Author: rwgk

.github/workflows/build-and-test.yml

@@ -20,15 +20,9 @@ jobs:
       fail-fast: false
       matrix:
         host-platform:
-          - linux-64
-          - linux-aarch64
           - win-64
         python-version:
-          - "3.13"
           - "3.12"
-          - "3.11"
-          - "3.10"
-          - "3.9"
         cuda-version:
           # Note: this is for build-time only.
           - "12.8.0"
@@ -205,6 +199,7 @@ jobs:
           echo "CUDA_VERSION=${{ matrix.cuda-version }}" >> $GITHUB_OUTPUT
 
   test-linux:
+    if: false  # jobs disabled
     strategy:
       fail-fast: false
       # TODO: add driver version here