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/java/maven/tests/maven.cue

@@ -0,0 +1,43 @@
+package maven
+
+import (
+	"strings"
+
+	"alpha.dagger.io/dagger"
+	"alpha.dagger.io/alpine"
+	"alpha.dagger.io/os"
+)
+
+TestData: dagger.#Artifact
+
+TestConfig: mavenOpts: strings.Join([
+			"-client",
+			"-XX:+TieredCompilation",
+			"-XX:TieredStopAtLevel=1",
+			"-Xverify:none",
+			"-Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn -Dorg.slf4j.simpleLogger.showDateTime=true",
+			"-Dorg.slf4j.simpleLogger.showDateTime=true -Dorg.slf4j.simpleLogger.dateTimeFormat=HH:mm:ss",
+], " ")
+
+TestSpringBoot: {
+	project: #Project & {
+		source: TestData
+
+		phases: ["install"]
+
+		env: MAVEN_OPTS: TestConfig.mavenOpts
+
+		args: ["--batch-mode"]
+	}
+
+	test: os.#Container & {
+		image: alpine.#Image & {
+			package: bash: true
+		}
+		copy: "/build": from: project.build
+		command: """
+			count=$(ls -1 /build/**/*.jar 2>/dev/null | wc -l)
+			test "$count" != "0"
+			"""
+	}
+}