Configure CI for Iron

Signed-off-by: Jacob Perron <jacobmperron@gmail.com>

Author: jacobperron

.github/workflows/build_and_test.yml

@@ -2,7 +2,7 @@ name: Continuous Integration
 
 on:
   push:
-    branches: ['humble']
+    branches: ['iron']
   pull_request:
 
 jobs:
@@ -12,9 +12,9 @@ jobs:
     - uses: actions/checkout@v2
     - uses: ros-tooling/setup-ros@v0.6
       with:
-        required-ros-distributions: humble
+        required-ros-distributions: iron
         use-ros2-testing: true
     - uses: ros-tooling/action-ros-ci@v0.3
       with:
         package-name: create_bringup create_description create_driver create_msgs create_robot
-        target-ros2-distro: humble
+        target-ros2-distro: iron