Build humble only

Author: rafal-gorecki

.github/workflows/ros-docker-image.yaml

@@ -50,14 +50,6 @@ jobs:
             repo_name: rosbot-gazebo
             platforms: linux/amd64
             ros_distro: humble
-          - dockerfile: Dockerfile.hardware
-            repo_name: ''
-            platforms: linux/amd64, linux/arm64
-            ros_distro: iron
-                    # - dockerfile: Dockerfile.gazebo
-                    #   repo_name: rosbot-gazebo
-                    #   platforms: linux/amd64
-                    #   ros_distro: iron
 
     steps: