No, you generally don't have to file a tax return if you you are not going to have to pay any tax. But you might want to file a return, as you might get a tax refund, or credits that require you to file a tax return to apply for them.

This CRA webpage has more info on who must file a tax return: https://www.canada.ca/en/services/taxes/income-tax/personal-income-tax/who-should-file-tax.html