feat: add spice installation step for Windows integration tests

Author: lukekim

.github/workflows/test.yml

@@ -122,6 +122,7 @@ jobs:
       - name: Init and start spice app (Windows)
         if: matrix.os == 'windows-latest'
         run: |
+          spice install
           spice init spice_qs
           cd spice_qs
           spice add spiceai/quickstart