containerlab: clab_admins should be added as as system group

Author: vista-

get.sh

@@ -253,7 +253,7 @@ installFile() {
     # Set SUID bit on the containerlab binary
     runAsRoot install -m 4755 "$TMP_ROOT/$BINARY_NAME" "$BIN_INSTALL_DIR/$BINARY_NAME"
     # Add clab admins group and add current user to it
-    runAsRoot groupadd clab_admins
+    runAsRoot groupadd -r clab_admins
     runAsRoot usermod -aG "$SUDO_USER" clab_admins
     echo "$BINARY_NAME installed into $BIN_INSTALL_DIR/$BINARY_NAME"
 }

utils/postinstall.sh

@@ -33,5 +33,5 @@ elif type "wget" > /dev/null 2>&1; then
     exit 0
 fi
 
-groupadd clab_admins
+groupadd -r clab_admins
 usermod -aG clab_admins "$SUDO_USER"

utils/quick-setup.sh

@@ -260,7 +260,7 @@ function install-containerlab {
 
     echo "Adding ${USER} to clab_admins group..."
 
-    sudo groupadd clab_admins
+    sudo groupadd -r clab_admins
     sudo usermod -aG clab_admins "$SUDO_USER"
 }