add install only version

cmd/install_only/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"apc-p15-tool/pkg/app"
+	"os"
+)
+
+// a version of the tool that always calls the `install` subcommand
+func main() {
+	// insert install command
+	args := []string{os.Args[0], "install"}
+	args = append(args, os.Args[1:]...)
+
+	app.Start(args)
+}

cmd/tool/main.go

@@ -2,6 +2,7 @@ package main
 
 import "apc-p15-tool/pkg/app"
 
+// main command line tool
 func main() {
-	app.Start()
+	app.Start(nil)
 }