While logged in via a user that has privileges to run gulp, run the following:
crontab -e
to edit your current "crontab" file.
Typically, within a cron job, you want to run any binary using absolute paths,
so an initial approach to running gulp build every minute might look like:
* * * * * cd /your/dir/to/run/in && /usr/local/bin/gulp build
However, you might see in the cron logs that you get this error:
/usr/bin/env: node: No such file or directory
To fix this, we need to add a symbolic link
within /usr/bin to point to the actual path of our node binary.
Be sure you are logged in as a sudo user, and paste in the following command to your terminal:
sudo ln -s $(which node) /usr/bin/node
Once this link is established, your cron task should run successfully.