Centos6 reached EOL

[VeselaHouba]

Step 6/12 : RUN yum install -y git | 265s
-- | --
960 | ---> Running in 7ed825f75a8e | 265s
961 | Loaded plugins: fastestmirror, ovl | 265s
962 | Setting up Install Process | 265s
963 | Determining fastest mirrors | 266s
964 | Error: Cannot find a valid baseurl for repo: base | 266s
965 | YumRepo Error: All mirror URLs are not using ftp, http[s] or file. | 266s
966 | Eg. Invalid release/repo/arch combination/ | 266s
967 | removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist.txt | 266s
968 | The command '/bin/sh -c yum install -y git' returned a non-zero code: 1 | 266s
969 | Unable to find image 'ruby-plugin-centos6:latest' locally | 266s
970 | Error response from daemon: pull access denied for ruby-plugin-centos6, repository does not exist or may require 'docker login': denied: requested access to the resource is denied

[jspaleta]

Hey!
thanks, it wont impact anything until we go to build again. But I'll refactor before the next release to drop centos6 and add amazon linux v2 while im at it..