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$ openssl s_client -servername token.actions.githubusercontent.com -showcerts -connect token.actions.githubusercontent.com:443 < /dev/null 2>/dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sed "0,/-END CERTIFICATE-/d" > certificate.crt | |
$ openssl x509 -in certificate.crt -fingerprint -noout | cut -f2 -d'=' | tr -d ':' | tr '[:upper:]' '[:lower:]' | |
6938fd4d98bab03faadb97b34396831e3780aea1 |