Ruby 2.6.3 fails because mirrorservice lacks github.com

[raypettersen]

Description

2.6.3 fails because mirrorservice lacks github.com

Steps to reproduce

curl -sSL https://rvm.io/pkuczynski.asc | gpg2 --import -
curl -L get.rvm.io | bash -s stable
/usr/local/rvm/bin/rvm reload
/usr/local/rvm/bin/rvm requirements run
/usr/local/rvm/bin/rvm install 2.6

Expected behavior

Ruby installs successfully.

Actual behavior

Ruby fails, because mirrorservice returns 404.

TestPackerBasic 2019-05-21T13:36:31+02:00 command.go:121: 1558438591,,ui,message,    build:   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
TestPackerBasic 2019-05-21T13:36:31+02:00 command.go:121: 1558438591,,ui,message,    build:                                  Dload  Upload   Total   Spent    Left  Speed
TestPackerBasic 2019-05-21T13:36:32+02:00 command.go:121: 1558438592,,ui,message,    build:   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
TestPackerBasic 2019-05-21T13:36:32+02:00 command.go:121: 1558438592,,ui,message,    build: curl: (22) The requested URL returned error: 404 Not Found