This is the official Heroku buildpack for installing the Salesforce CLI into your Heroku dyno. It will also install
jq, a command-line tool that is like sed for JSON data, which makes it easy to interact with JSON output from the Salesforce CLI.
jq, you simply need to export the appropriate paths:
export PATH="$BUILD_DIR/vendor/sfdx/cli/bin:$PATH" export PATH="$BUILD_DIR/vendor/sfdx/jq:$PATH"
$BUILD_DIR is the path where your apps source is stored on the Heroku dyno.
Copy the snippet above into CLI.