ci/ros: fix ccache

Author: jcarpent

.github/workflows/ros_ci.yml

@@ -16,7 +16,7 @@ jobs:
           - {ROS_DISTRO: rolling}
           - {ROS_DISTRO: iron}
     env:
-      CCACHE_DIR: /home/runner/.ccache # Enable ccache
+      # CCACHE_DIR: /home/runner/.ccache # Enable ccache
       PRERELEASE: true
       BUILDER: colcon
     runs-on: ubuntu-latest