cue modules: move stdlib to pkg/alpha.dagger.io

In preparation for Europa, we will vendor multiple CUE modules:

- `pkg/alpha.dagger.io`: legacy non-europa packages
- `pkg/dagger.io`: core Europa packages
- `pkg/universe.dagger.io`: Europa universe

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

pkg/alpha.dagger.io/gcp/gcs/tests/gcs.cue

@@ -0,0 +1,43 @@
+package gcs
+
+import (
+	"alpha.dagger.io/dagger"
+	"alpha.dagger.io/gcp"
+	"alpha.dagger.io/random"
+)
+
+TestConfig: {
+	gcpConfig: gcp.#Config
+	bucket:    string @dagger(input)
+}
+
+TestDirectory: dagger.#Artifact
+
+TestGCSObject: {
+	suffix: random.#String & {
+		seed: "gcs"
+	}
+
+	target: "gs://\(TestConfig.bucket)/\(suffix.out)/"
+
+	deploy: #Object & {
+		always:   true
+		config:   TestConfig.gcpConfig
+		source:   TestDirectory
+		"target": target
+	}
+
+	verifyFile: #VerifyGCS & {
+		config: TestConfig.gcpConfig
+		target: deploy.target
+		url:    deploy.url
+		file:   "dirFile.txt"
+	}
+
+	verifyDir: #VerifyGCS & {
+		config: TestConfig.gcpConfig
+		target: deploy.target
+		url:    deploy.url
+		file:   "foo.txt"
+	}
+}