title: how to install certificates with private keys on macOS?
body: <p>I'm trying to set up some certificates so then I can work on a web devolopment/automation project. I need to install two certs, they are .crt and .pem files. I also have a .key file to work with.
  I know that in Fedora/RHEL I can do the following in order to create a system link:</p>
  <p><code>ln -s ~/appcerts /etc/pki/tls/certs/enterprise_services</code></p>
  <p>where the <code>appcerts</code> folder hold the .pem, .crt and .key file.</p>
  <p>but I can't seem to find how to do that in MacOS. I know that I can use keychain access to setup the .crt and the .pem files, but I don't see any option to set up the .key file. I've already tried to add it with the ssh-add but that doesn't work. I'm returned wit a</p>
  <p><code>x509 error, certificate signed by unkown authority.</code></p>