Certificate for sks-keyservers.net cannot be loaded when PHIVE is run from a PHAR

[sebastianheuer]

$ phive install phpunit                                                                                              
Phive 0.2.0-91-g4dd3159 - Copyright (C) 2015-2016 by Arne Blankerts, Sebastian Heuer and Contributors
Downloading repository list from https://phar.io/data/repositories.xml
Downloading https://phar.io/data/repositories.xml [ 873 B / 873 B - 100% ]
Downloading https://phar.phpunit.de/phive.xml [ 57.52 KB / 57.52 KB - 100% ]
Downloading https://phar.phpunit.de/phpunit-5.3.1.phar [ 2.70 MB / 2.70 MB - 100% ]
Downloading https://phar.phpunit.de/phpunit-5.3.1.phar.asc [ 819 B / 819 B - 100% ]
Downloading key 4AA394086372C20A
Trying https://hkps.pool.sks-keyservers.net
[WARNING]  Failed with status code 0: error setting certificate verify locations:
  CAfile: phar:///vagrant/phive/build/phar/phive-0.2.0-91-g4dd3159.phar/src/../conf/ssl/ca_certs/sks-keyservers.netCA.pem
  CApath: /etc/ssl/certs
[ERROR]    PublicKey 4AA394086372C20A not found on key servers

As @theseer found out this is due to the fact that Curl is unable to access files that lie within a PHAR (https://bugs.php.net/bug.php?id=69035).

The suggested workaround is to copy the .pem file to a temporary location (outside of the phar) and let Curl use that file instead.