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/docker/tests/command-ssh/command.cue

@@ -0,0 +1,26 @@
+package docker
+
+import (
+	"alpha.dagger.io/dagger"
+)
+
+TestConfig: {
+	host: dagger.#Input & {string}
+	user: dagger.#Input & {string}
+	key:  dagger.#Input & {dagger.#Secret}
+}
+
+TestPassword: dagger.#Input & {dagger.#Secret}
+
+TestSSH: client: #Command & {
+	command: #"""
+			docker $CMD && [ -f /run/secrets/password ]
+		"""#
+	ssh: {
+		host: TestConfig.host
+		user: TestConfig.user
+		key:  TestConfig.key
+	}
+	secret: "/run/secrets/password": TestPassword
+	env: CMD:                        "version"
+}