iron is dead (#186)

Author: mikeferguson

.github/workflows/industrial_ci_action.yaml

@@ -11,7 +11,6 @@ jobs:
     strategy:
       matrix:
         env:
-          - {ROS_DISTRO: iron, ROS_REPO: main}
           - {ROS_DISTRO: jazzy, ROS_REPO: main}
     runs-on: ubuntu-latest
     steps: