See the link for the respective country:

Portugal: https://www.dgs.pt/normas-orientacoes-e-informacoes/normas-e-circulares-normativas.aspx

Brazil: https://www.gov.br/economia/pt-br/centrais-de-conteudo/publicacoes/boletins/covid-19

Germany: https://www.bundesgesundheitsministerium.de/en/service/gesetze-und-verordnungen/guv-19-lp/coronavirus-einreiseverordnung.html

Spain: https://www.sanidad.gob.es/profesionales/saludPublica/ccayes/alertasActual/nCov/spth.htm

United Kingdom: https://www.nhs.uk/conditions/coronavirus-covid-19/

Netherlands: https://www.rijksoverheid.nl/zoeken?trefwoord=covid&search-submit

Miami: https://miamidade.floridahealth.gov/

New York: https://www.health.ny.gov/

Buenos Aires: https://www.argentina.gob.ar/salud

Cape Verde: https://www.minsaude.gov.cv/index.php/documentosite/coronavirus-covid-19

Sao Tome: http://ms.gov.st/?page_id=2235

Morocco: https://www.visitmorocco.com/en/travel-info/covid-19-travel-safely-to-morocco