Add instructions to add robostack channel to micromamba environment

Author: Jack-Punter

docs/GettingStarted.md

@@ -37,29 +37,40 @@ Note that the instructions for Conda and Micromamba are virtually identical apar
         ```bash
         # Create a ros-noetic desktop environment
         micromamba create -n ros_env -c conda-forge -c robostack-noetic ros-noetic-desktop
+        # Activate the environment
+        micromamba activate ros_env
+        # Add the robostack channel to the environemnt
+        micromamba config append channels robostack-noetic --env
         ```
     === "ROS 2 Humble"
         ```bash
         # Create a ros-humble desktop environment
         micromamba create -n ros_env -c conda-forge -c robostack-humble ros-humble-desktop
+        # Activate the environment
+        micromamba activate ros_env
+        # Add the robostack channel to the environemnt
+        micromamba config append channels robostack-humble --env
         ```
     === "ROS 2 Jazzy"
         ```bash
         # Create a ros-jazzy desktop environment
         micromamba create -n ros_env -c conda-forge -c robostack-jazzy ros-jazzy-desktop
+        # Activate the environment
+        micromamba activate ros_env
+        # Add the robostack channel to the environemnt
+        micromamba config append channels robostack-jazzy --env
         ```
 
     === "ROS 2 Kilted"
         ```bash
         # Create a ros-kilted desktop environment
         micromamba create -n ros_env -c conda-forge -c robostack-kilted ros-kilted-desktop
+        # Activate the environment
+        micromamba activate ros_env
+        # Add the robostack channel to the environemnt
+        micromamba config append channels robostack-kilted --env
         ```
 
-    ```bash
-    # Activate the environment
-    micromamba activate ros_env
-    ```
-
     ## Installing tools for local development
     ```bash title="Default tools to help with local development of ROS packages"
     micromamba activate ros_env