Gem::Security::TrustDir#trust_cert

# File tmp/rubies/ruby-3.3.0/lib/rubygems/security/trust_dir.rb, line 89
def trust_cert(certificate)
  verify

  destination = cert_path certificate

  File.open destination, "wb", 0o600 do |io|
    io.write certificate.to_pem
    io.chmod(@permissions[:trusted_cert])
  end
end