Add git-lfs package installation to package role

Currently there is no role which can configure and install git-lfs package. This might not be required for normal actor hosts, but could be required for some support hosts. So let's add tasks to configure and install git-lfs package into packages role.

• gpg key for apt from https://packagecloud.io/github/git-lfs/gpgkey
• download and place into source.list.d from https://packagecloud.io/install/repositories/github/git-lfs/config_file.list?os=${os}&dist=${dist}&source=script
• install git-lfs package