Provides support for the 'heroku container:push' --recursive argument #162
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It is possible to build and push multiple docker images/heroku processes at one time by issuing the --recursive option.
https://devcenter.heroku.com/articles/container-registry-and-runtime
This contribution checks to see whether multiple processes have been supplied in the 'docker_heroku_process_type' option and if so appends the --recursive option to the 'heroku container:push' command