generate qr code for vacine pass (all the help is welcome)
useful links : COSE : https://datatracker.ietf.org/doc/html/rfc8152
dgc test data : https://github.com/eu-digital-green-certificates/dgc-testdata
https://ec.europa.eu/health/sites/default/files/ehealth/docs/digital-green-certificates_v4_en.pdf
https://ec.europa.eu/health/sites/default/files/ehealth/docs/digital-green-certificates_v3_en.pdf
https://github.com/eu-digital-green-certificates/dgca-issuance-service
https://blog.callicode.fr/post/2021/covid_pass.html
https://github.com/ehn-dcc-development/ehn-sign-verify-python-trivial/
https://github.com/eu-digital-green-certificates/dgc-testdata