I don't know whether it was done on purpose or not but suddenly all our tests are failing because each single release tag for https://github.com/wikimedia/mediawiki/releases did vanished [0] which means we can't download any specific release from github (as it is faster than any WMF node) because of:
wget https://github.com/wikimedia/mediawiki/archive/1.23.5.tar.gz -O 1.23.5.tar.gz --2015-05-26 09:44:28-- https://github.com/wikimedia/mediawiki/archive/1.23.5.tar.gz Resolving github.com (github.com)... 192.30.252.130 Connecting to github.com (github.com)|192.30.252.130|:443... connected. HTTP request sent, awaiting response... 302 Found Location: https://codeload.github.com/wikimedia/mediawiki/tar.gz/1.23.5 [following] --2015-05-26 09:44:28-- https://codeload.github.com/wikimedia/mediawiki/tar.gz/1.23.5 Resolving codeload.github.com (codeload.github.com)... 192.30.252.146 Connecting to codeload.github.com (codeload.github.com)|192.30.252.146|:443... connected. HTTP request sent, awaiting response... 404 Not Found 2015-05-26 09:44:28 ERROR 404: Not Found.
[0] https://cloud.githubusercontent.com/assets/1245473/7809880/cfdc973e-039d-11e5-8a06-b037ec7a7094.png