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/drivy/heroku-buildpack-snowflake-odbc/master/snowflake-odbc-2.25.4.x86_64.deb
Add buildpacks
heroku buildpacks:add --index 1 heroku-community/apt
heroku buildpacks:add https://github.com/drivy/heroku-buildpack-snowflake-odbc