refactor: first pass at rewriting apps plugin in go

plugins/apps/vendor/github.com/codeskyblue/go-sh/example/example1.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/codeskyblue/go-sh"
+)
+
+func main() {
+	sh.Command("echo", "hello").Run()
+	out, err := sh.Command("echo", "hello").Output()
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println("output is", string(out))
+
+	var a int
+	sh.Command("echo", "2").UnmarshalJSON(&a)
+	fmt.Println("a =", a)
+
+	s := sh.NewSession()
+	s.Alias("hi", "echo", "hi")
+	s.Command("hi", "boy").Run()
+
+	fmt.Print("pwd = ")
+	s.Command("pwd", sh.Dir("/")).Run()
+
+	if !sh.Test("dir", "data") {
+		sh.Command("echo", "mkdir", "data").Run()
+	}
+
+	sh.Command("echo", "hello", "world").
+		Command("awk", `{print "second arg is "$2}`).Run()
+	s.ShowCMD = true
+	s.Command("echo", "hello", "world").
+		Command("awk", `{print "second arg is "$2}`).Run()
+
+	s.SetEnv("BUILD_ID", "123").Command("bash", "-c", "echo $BUILD_ID").Run()
+	s.Command("bash", "-c", "echo current shell is $SHELL").Run()
+}