As a result the builds fail:
[RuntimeException]
Failed to execute git clone --mirror 'https://***:***@github.com/php-mime-mail-parser/php-mime-mail-parser.git' '/tmp/tuleap_build/.composer/cache/vcs/https---github.com-php-mime-mail-parser-php-mime-mail-parser.git/'
Cloning into bare repository '/tmp/tuleap_build/.composer/cache/vcs/https---github.com-php-mime-mail-parser-php-mime-mail-parser.git'...
fatal: unable to access 'https://github.com/php-mime-mail-parser/php-mime-mail-parser.git/': SSL certificate problem: unable to get local issuer certificate
Issue can be intermittent (for now) as it depends which certificate is used (it looks like GitHub is in the process of switching the root CA used to sign their certificates). The Docker image we use to do the preparation phase of the source does not include a copy of /etc/ssl/certs/ca-certificates.crt
so we are falling back to the embedded one which is not up to date.