Use multi-line in Amazon and CentOS builders
The following discussion from !206 (merged) should be addressed:
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@rmarshall started a discussion: This should probably be multi-line like the others, yes?
RUN amazon-linux-extras install epel -y \ && yum install -y yum-utils \ && yum-config-manager --enable epel
We will address this for Amazon and CentOS 8 both as a follow up.