This requires heroku-buildpack-apt to run before it, with the following in the Aptfile:
unix-odbc
unixodbc-dev <-- required for ruby-odbc gem
https://raw.githubusercontent.com/carwow/heroku-buildpack-snowflake-odbc/master/snowflake-odbc.deb
Add buildpack
heroku buildpacks:add https://github.com/TheScionGroup/heroku-buildpack-snowflake-odbc