Bring back everything but Windows

Author: pamelafox

.github/workflows/app-tests.yaml

@@ -59,6 +59,7 @@ jobs:
           run: .github\workflows\install-pgvector.bat
 
         - name: (Windows) Start postgreSQL
+          if: matrix.os == 'windows-latest'
           uses: ikalnytskyi/action-setup-postgres@v6
           with:
             username: ${{ env.POSTGRES_USERNAME }}