basic tests for alpine go and yarn

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

tests/stdlib/go/go.cue

@@ -0,0 +1,33 @@
+package go
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/go"
+	"dagger.io/alpine"
+)
+
+TestData: dagger.#Dir
+
+TestGoBuild: {
+	build: go.#Build & {
+		source: TestData
+		output: "/bin/testbin"
+	}
+
+	test: #dagger: compute: [
+		dagger.#Load & {from: alpine.#Image},
+		dagger.#Exec & {
+			args: [
+				"sh",
+				"-ec",
+				"""
+					test "$(/bin/testbin)" = "hello world"
+					""",
+			]
+			mount: "/bin/testbin": {
+				from: build
+				path: "/bin/testbin"
+			}
+		},
+	]
+}

tests/stdlib/go/testdata/go.mod

@@ -0,0 +1,3 @@
+module main
+
+go 1.14

tests/stdlib/go/testdata/main.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("hello world")
+}