OK, figured out that in powershell if I do a 'docker ps' it will list my containers. So the web container is xibo_cms-web_1, so I do a 'docker -it xibo_cms-web_1 bash', and it opens a shell for me.. then I found the userscripts director, and did a cd ./var/www/cms/web/userscripts, and sure enough, there's the script I build (google_cal_RSS.php). So I run it, (php google_cal_RSS.php), and of course, the 'vendor' installation that google had me create via 'Composer' isn't there. So, my question now is: How do i get the Composer installation there? It would appear that Docker has 'composer-like' attributes, and maybe I would get the Google vendor directories there? Or do I just totally reinstall composer into the userscripts tree?
Oh, and if someone has a better calendar way, please respond! I saw the Google calendar 'imbed' trick, but that doesn't show end times of the calendar entries.