In October 2021 Portugal has reduced significantly its rules related to Covid-19 and the economy is now fully open, though some precautionary rules still apply (e.g. face mask indoors or in large public gatherings). If you are looking for the latest information about travel rules and COVID-19 requirements per country of origin, these are two essential sources of information in Portugal:

Website of the Portuguese Tourism Office:

https://www.visitportugal.com/en/content/covid-19-measures-implemented-portugal

Website of the Portuguese Borders Police:

https://imigrante.sef.pt/en/covid-19/faqs/#1596230859073-a1cdfe6a-4ada