// http://cacerts.digicert.com/DigiCertTLSRSASHA2562020CA1-1.crt
// CN: DigiCert TLS RSA SHA256 2020 CA1 => name: DigiCert_TLS_RSA_SHA256_2020_CA1
// not valid before: 2021-04-14 00:00:00
// not valid after:  2031-04-13 23:59:59
const char cert_DigiCert_TLS_RSA_SHA256_2020_CA1 [] PROGMEM = R"CERT(
-----BEGIN CERTIFICATE-----
MIIEvjCCA6agAwIBAgIQBtjZBNVYQ0b2ii+nVCJ+xDANBgkqhkiG9w0BAQsFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBD
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U0EgU0hBMjU2IDIwMjAgQ0ExMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC
AQEAwUuzZUdwvN1PWNvsnO3DZuUfMRNUrUpmRh8sCuxkB+Uu3Ny5CiDt3+PE0J6a
qXodgojlEVbbHp9YwlHnLDQNLtKS4VbL8Xlfs7uHyiUDe5pSQWYQYE9XE0nw6Ddn
g9/n00tnTCJRpt8OmRDtV1F0JuJ9x8piLhMbfyOIJVNvwTRYAIuE//i+p1hJInuW
raKImxW8oHzf6VGo1bDtN+I2tIJLYrVJmuzHZ9bjPvXj1hJeRPG/cUJ9WIQDgLGB
Afr5yjK7tI4nhyfFK3TUqNaX3sNk+crOU6JWvHgXjkkDKa77SU+kFbnO8lwZV21r
eacroicgE7XQPUDTITAHk+qZ9QIDAQABo4IBgjCCAX4wEgYDVR0TAQH/BAgwBgEB
/wIBADAdBgNVHQ4EFgQUt2ui6qiqhIx56rTaD5iyxZV2ufQwHwYDVR0jBBgwFoAU
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CCsGAQUFBwMBBggrBgEFBQcDAjB2BggrBgEFBQcBAQRqMGgwJAYIKwYBBQUHMAGG
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MAgGBmeBDAECATAIBgZngQwBAgIwCAYGZ4EMAQIDMA0GCSqGSIb3DQEBCwUAA4IB
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ax3pfs8LulicWdSQ0/1s/dCYbbdxglvPbQtaCdB73sRD2Cqk3p5BJl+7j5nL3a7h
qG+fh/50tx8bIKuxT8b1Z11dmzzp/2n3YWzW2fP9NsarA4h20ksudYbj/NhVfSbC
EXffPgK2fPOre3qGNm+499iTcc+G33Mw+nur7SpZyEKEOxEXGlLzyQ4UfaJbcme6
ce1XR2bFuAJKZTRei9AqPCCcUZlM51Ke92sRKw2Sfh3oius2FkOH6ipjv3U/697E
A7sKPPcw7+uvTPyLNhBzPvOk
-----END CERTIFICATE-----
  )CERT";

// how to find the certificate was not easy. finally I found it using Mozilla Firefox.
// opened one of the bitmaps, e.g. https://raw.githubusercontent.com/ZinggJM/GxEPD2/master/extras/bitmaps/logo200x200.bmp
// clicked the lock symbol, Connection secure clicked >, show connection details, clicked More Information, clicked View Certificate, clicked Download PEM (chain),
// Opened the .pem file and copied the pems into R"CERT(...)CERT"; strings.
// for https://raw.githubusercontent.com all three pems work on ESP8266 and ESP32, if time is set from ntp.
// but using a root certificate is preferred, as its validity may be longer.

// https://raw.githubusercontent.com
// issued by DigiCert Inc : DigiCert TLS RSA SHA256 2020 CA1
// not valid before: Fri, 18 Mar 2022 00:00:00 GMT
// not valid after:  Tue, 21 Mar 2023 23:59:59 GMT
const char github_io_chain_pem_first [] PROGMEM = R"CERT(
-----BEGIN CERTIFICATE-----
MIIHEzCCBfugAwIBAgIQC44ztdGGen6l0VAu1+MWiTANBgkqhkiG9w0BAQsFADBP
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMSkwJwYDVQQDEyBE
aWdpQ2VydCBUTFMgUlNBIFNIQTI1NiAyMDIwIENBMTAeFw0yMjAzMTgwMDAwMDBa
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bmlhMRYwFAYDVQQHEw1TYW4gRnJhbmNpc2NvMRUwEwYDVQQKEwxHaXRIdWIsIElu
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Y29tL0RpZ2lDZXJ0VExTUlNBU0hBMjU2MjAyMENBMS0xLmNydDAJBgNVHRMEAjAA
MIIBfwYKKwYBBAHWeQIEAgSCAW8EggFrAWkAdgDoPtDaPvUGNTLnVyi8iWvJA9PL
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f88AdgA1zxkbv7FsV78PrUxtQsu7ticgJlHqP+Eq76gDwzvWTAAAAX+dgO/rAAAE
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gxFf6+kgsz+EwtF80Tb0ZR2DC7O2HSi0JGiihPgKO/3bXHZUc9cc4NkL7J842yFI
rRwPHABMq2nLq7LCuGdJn+2tG76DAOXCtHMQ6XfuAq1FoPbtxXdWzynOJdDelPC6
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bYVRSYaNfnS0VkPlwcR9Ubhx9wEuG4GuDus7OWItwFqm2c3peKQQK8+2CDMUHDUC
QafDHvXcWeRdqQouCQC1tDlRAzPLKTcLD6EVltnPR5HQITRvHVgm
-----END CERTIFICATE-----
)CERT";
const char github_io_chain_pem_second [] PROGMEM = R"CERT(
-----BEGIN CERTIFICATE-----
MIIEvjCCA6agAwIBAgIQBtjZBNVYQ0b2ii+nVCJ+xDANBgkqhkiG9w0BAQsFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBD
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MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxKTAnBgNVBAMTIERpZ2lDZXJ0IFRMUyBS
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A7sKPPcw7+uvTPyLNhBzPvOk
-----END CERTIFICATE-----
)CERT";
const char github_io_chain_pem_third [] PROGMEM = R"CERT(
-----BEGIN CERTIFICATE-----
MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=
-----END CERTIFICATE-----
)CERT";