An updated guide to Docker and ROS 2

Since then, I've had the chance to use Docker more in my work and have picked up some new tricks. This was long overdue, but I've finally collected my updated learnings in this post. Recently, I encountered an article titled ROS Docker; 6 reasons why they are not a good fit, and I largely agree with it. However, the reality is that it's still quite difficult to ensure a reproducible ROS environment for people who haven't spent years fighting the ROS learning curve and are adept at debugging dependency and/or build errors… so Docker is still very much a crutch that we fall back on to get working demos (and sometimes products!) If the article above hasn't completely discouraged you from embarking on this Docker adventure, please enjoy reading.