Drone: Add Windows PR pipeline (#26589)

* Drone: Add Windows PR pipeline
* CI: Add Dockerfile for WiX image

scripts/build/ci-wix/Magefile.go

@@ -0,0 +1,27 @@
+//+build mage
+
+package main
+
+import (
+	"github.com/magefile/mage/mg"
+	"github.com/magefile/mage/sh"
+)
+
+const imageName = "grafana/ci-wix:0.1.1"
+
+// Build builds the Docker image.
+func Build() error {
+	if err := sh.RunV("docker", "build", "-t", imageName, "."); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Publish publishes the Docker image.
+func Publish() error {
+	mg.Deps(Build)
+	return sh.RunV("docker", "push", imageName)
+}
+
+var Default = Build