Fix HOST_PLATFORM variable

Author: mdboom

.github/workflows/coverage.yml

@@ -27,6 +27,7 @@ env:
   GPU: "a100"
   DRIVER: "latest"
   ARCH: "x86_64"
+  HOST_PLATFORM: "linux-64"
 
 jobs:
   coverage:
@@ -62,7 +63,7 @@ jobs:
         env:
           BUILD_CUDA_VER: ${{ env.CUDA_VER }}
           CUDA_VER: ${{ env.CUDA_VER }}
-          HOST_PLATFORM: linux-64
+          HOST_PLATFORM: ${{ env.HOST_PLATFORM }}
           LOCAL_CTK: ${{ env.LOCAL_CTK }}
           PY_VER: ${{ env.PY_VER }}
           SHA: ${{ github.sha }}