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/gcr/tests/gcr.cue

@@ -0,0 +1,86 @@
+package main
+
+import (
+	"alpha.dagger.io/gcp"
+	"alpha.dagger.io/gcp/gcr"
+	"alpha.dagger.io/dagger/op"
+	"alpha.dagger.io/random"
+)
+
+TestConfig: gcpConfig: gcp.#Config
+
+TestGCR: {
+	suffix: random.#String & {
+		seed: ""
+	}
+
+	repository: "gcr.io/dagger-ci/test"
+	tag:        "test-gcr-\(suffix.out)"
+
+	creds: gcr.#Credentials & {
+		config: TestConfig.gcpConfig
+	}
+
+	push: {
+		ref: "\(repository):\(tag)"
+
+		#up: [
+			op.#DockerBuild & {
+				dockerfile: """
+				FROM alpine
+				RUN echo \(suffix.out) > /test
+				"""
+			},
+
+			op.#DockerLogin & {
+				target:   repository
+				username: creds.username
+				secret:   creds.secret
+			},
+
+			op.#PushContainer & {
+				"ref": ref
+			},
+		]
+	}
+
+	pull: #up: [
+		op.#DockerLogin & {
+			target:   push.ref
+			username: creds.username
+			secret:   creds.secret
+		},
+
+		op.#FetchContainer & {
+			ref: push.ref
+		},
+	]
+
+	verify: #up: [
+		op.#Load & {
+			from: pull
+		},
+
+		op.#Exec & {
+			always: true
+			args: [
+				"sh", "-c", "test $(cat test) = \(suffix.out)",
+			]
+		},
+	]
+
+	verifyBuild: #up: [
+		op.#DockerLogin & {
+			target:   push.ref
+			username: creds.username
+			secret:   creds.secret
+		},
+
+		op.#DockerBuild & {
+			dockerfile: #"""
+				FROM \#(push.ref)
+				RUN test $(cat test) = \#(suffix.out)
+			"""#
+		},
+	]
+}