Let PINTO_CPANM_URL be configured via environment to simplify testing of upgrades to cpanm.
Also, avoid a redirect by setting the default to the new location at https://raw.githubusercontent.com/.
This helps with SSL implementations that get confused by the cert at the origin of the redirect.
Let PINTO_CPANM_URL be configured via environment to simplify testing of upgrades to cpanm. Also, avoid a redirect by setting the default to the new location at https://raw.githubusercontent.com/. This helps with SSL implementations that get confused by the cert at the origin of the redirect.