Log/uid and user information for garm for better traceability (#41)

* log: new log

* feat: debug mode

* log: fixed to warning as unprepared currentUser won't stop the process

Author: mlajkim

service/server.go

@@ -18,6 +18,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"os/user"
 	"sync"
 	"time"
 
@@ -127,6 +128,15 @@ func (s *server) ListenAndServe(ctx context.Context) chan []error {
 	wg := new(sync.WaitGroup)
 	wg.Add(2)
 
+	currentUser, err := user.Current()
+	if err != nil {
+		glg.Warn(err)
+	} else {
+		// Log the current user information:
+		// With security perspective of UID: https://help.switch.ch/aai/support/documents/attributes/uid/#:~:text=uid%20is%20security%20sensitive%20since,anyhow%20not%20unique%20across%20organizations.
+		glg.Debugf("Running garm as user [%s] with UID [%s] ...", currentUser.Username, currentUser.Uid)
+	}
+
 	// start both webhook server and health check server
 	go func() {
 		s.mu.Lock()