Move Cloud Run image property to GCP config struct

Signed-off-by: Tihomir Jovicic <tihomir.jovicic.develop@gmail.com>

tests/stdlib/gcp/cloudrun/main.cue

@@ -0,0 +1,16 @@
+package cloudrun
+
+import (
+	"dagger.io/gcp"
+	"dagger.io/gcp/cloudrun"
+)
+
+TestConfig: gcpConfig: gcp.#Config & {
+	region: "us-west2"
+}
+
+TestCloudRun: deploy: cloudrun.#Deploy & {
+	serviceName: "cloudrun-test"
+	config:      TestConfig.gcpConfig
+	image:       "gcr.io/dagger-ci/cloudrun-test:latest"
+}