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/argocd/tests/infra/infra.cue

@@ -0,0 +1,14 @@
+package infra
+
+import (
+	"alpha.dagger.io/dagger"
+	"alpha.dagger.io/kubernetes"
+)
+
+TestKubeconfig: dagger.#Input & {string}
+
+TestArgoInfra: kubernetes.#Resources & {
+	kubeconfig: TestKubeconfig
+	namespace:  "argocd"
+	url:        "https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml"
+}