logging into the CLI locally
$ heroku login
followed by logging in to heroku's container service
$ heroku container:login
and building/pushing the image
$ heroku container:push web -a filmstrip-app --arg
NODE_VERSION=8.16.1,INSTALL_MONGO=false,INSTALL_GRAPHICSMAGICK=false,INSTALL_PHANTOMJS=false
and then
$ heroku container:release web -a filmstrip-app