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/secretmanager/tests/secrets.cue

@@ -0,0 +1,33 @@
+package secretmanager
+
+import (
+	"alpha.dagger.io/dagger"
+	"alpha.dagger.io/gcp"
+	"alpha.dagger.io/gcp/secretmanager"
+	"alpha.dagger.io/os"
+)
+
+TestConfig: gcpConfig: gcp.#Config
+
+TestSecrets: {
+	secret: secretmanager.#Secrets & {
+		config: TestConfig.gcpConfig
+		secrets: {
+			databasePassword: dagger.#Secret @dagger(input)
+		}
+	}
+
+	if len(secret.references) > 0 {
+		cleanup: os.#Container & {
+			image: gcp.#GCloud & {
+				config: TestConfig.gcpConfig
+			}
+			shell: path: "/bin/bash"
+			always: true
+
+			command: #"""
+					gcloud -q secrets delete databasePassword
+				"""#
+		}
+	}
+}