Build system setup failure due to OS / Curl SSL Certificate Issues

[native-api]

Problem with the 3rd-party server(s), same as below but with different intermediate certificate(s) missing: SSL Server Test: dlang.org (Powered by Qualys SSL Labs) .

Testthat: cannot open the connection to

Bottom line: install the intermediate “Entrust Certification Authority - L1K” TLS certificate that this server erroneously doesn’t provide to the local trusted certificates store, as per https://askubuntu.com/questions/645818/how-to-install-certificates-for-command-line: before_install: - sudo mkdir -p /usr/local/share/ca-certificates/ - wget https://entrust.com/root-certificates/entrust_l1k.cer - openssl x509 -in entrust_l1k.cer -out entrust_l1k.crt - sudo mv entrust_l1k.crt /usr/local…