basic tests for alpine go and yarn

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

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")
+}