fix creds prep

Author: yunchengyang515

.github/workflows/stackql-assert.yml

@@ -18,7 +18,18 @@ jobs:
       uses: actions/checkout@v3
 
 
+    - name: Prep Google Creds (Windows)
+      if: ${{ matrix.os == 'windows-latest'}}
+      run: | ## use the secret to create json file
+        $GoogleCreds = [System.Environment]::GetEnvironmentVariable("GOOGLE_CREDS_ENV")
+        $GoogleCredsDecoded = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($GoogleCreds))
+        Write-Output $GoogleCredsDecoded | Set-Content sa-key.json
+      shell: pwsh
+      env:
+        GOOGLE_CREDS_ENV: ${{ secrets.GOOGLE_CREDS }}
+  
     - name: Prep Google Creds (bash)
+      if: ${{ matrix.os != 'windows-latest' }}
       shell: bash
       run: | ## use the base64 encoded secret to create json file
         sudo echo ${{ secrets.GOOGLE_CREDS }} | base64 -d > sa-key.json