Change the CI workflow to powershell and fixes the missing env var issue
Change the CI workflow to powershell and fixes the missing env var issue

Signed-off-by: mikeee <7f550a9f4c44173a37664d938f1355f0f92a47a7@mike.ee>

GoogleCloudPlatform/prometheus,prometheus/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,keegancsmith/prometheus,prometheus/prometheus,keegancsmith/prometheus,prometheus/prometheus,keegancsmith/prometheus,alileza/prometheus,alileza/prometheus,prometheus/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus