Detect if app in building in Bitrise in project build phase

I have a build phase script where I want to detect if the app is building locally or in Bitrise, and toggle the path to the Info.plist accordingly. I have tried that approach but it doesn’t seem to work.

Any ideas?

#!/bin/bash

if [[ -x /usr/libexec/PlistBuddy && -z "$BITRISE_IO" ]]; then
    echo "Bitrise build"
    APP_PATH="${PROJECT_DIR}/${TARGET_NAME}"
    echo $APP_PATH
    ENVIRONMENT=$(/usr/libexec/PlistBuddy -c 'print BaseUrl' "${APP_PATH}/Resources/Info.plist")
    echo "Environment is ${ENVIRONMENT} - read from plist"
else
    echo "Local build"
    APP_PATH="${BITRISE_SOURCE_DIR}/MyApp"
    echo $APP_PATH
    ENVIRONMENT="${BASE_URL}"
    echo "Environment is ${ENVIRONMENT} - read from env var"
fi

You should be able to use $BITRISE_IO to detect if the build is running on Bitrise.io