Move checkRoot to main

Signed-off-by: Dimitris Karakasilis <dimitris@karakasilis.me>

internal/agent/agent.go

@@ -1,7 +1,6 @@
 package agent
 
 import (
-	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -96,11 +95,3 @@ func Run(opts ...Option) error {
 	}
 	return err
 }
-
-func checkRoot() error {
-	if os.Geteuid() != 0 {
-		return errors.New("this command requires root privileges")
-	}
-
-	return nil
-}