I'm proposing/requesting a way for a launch file or launch command to automatically be run when the computer boots, which is fully integrated and automated via ros2/launch.

Based on conversation at:
https://groups.google.com/forum/#!topic/ros-sig-ng-ros/0HzF5J6hu4k

Here is one proposal for how this could work, although alternative designs are worth considering:

roslaunch <my_params> --add-at-startup

expected behavior:

1. launching may or may not occur right away (tbd)
2. shut down machine
3. turn on machine
4. launch command runs

roslaunch --list-at-startup

expected behavior:

prints a list of commands that run every time the machine starts (perhaps with numeric ids?)

roslaunch --remove-at-startup <id>

expected behavior:

remove the item with id from the startup list.

<lauch_at_startup>

a tag that goes in .launch files, whenever the launch is run this automatically adds it to the startup list