Feat : Handle users for election

.env

 HOSTNAME=elections.127.0.0.1.nip.io
 ADMIN_GROUP=ADMINS
-CLIENT_GROUP=VISUALIZER
+VISUALIZER_GROUP=VISUALIZER
 
 # Needed to user OAuth2 authentication :
 REDIRECT_URL=https://${HOSTNAME}/OAuth2Callback

internal/auth/oauth2.go

@@ -163,8 +163,8 @@ func (d *DataHandler) addUserInMemory(userOauth2 UserOAuth2) (User, error) {
 	for _, userRole := range userOauth2.Groups {
 		if userRole != "" && (userRole == os.Getenv("ADMIN_GROUP")) {
 			user.Role = "ADMIN"
-		} else if userRole != "" && (userRole == os.Getenv("CLIENT_GROUP")) {
-			user.Role = "CLIENT"
+		} else if userRole != "" && (userRole == os.Getenv("VISUALIZER_GROUP")) {
+			user.Role = "VISUALIZER"
 		} else {
 			return user, errors.New("user not in an app group")
 		}