Merge pull request #3451 from jperrin/master

add aarch64 into the mix

library/centos

@@ -6,6 +6,9 @@ Constraints: !aufs
 Tags: latest, centos7, 7
 GitFetch: refs/heads/CentOS-7
 GitCommit: 16dab97b0ce72b1db7a2f9b02c76e452cb0a63cb
+arm64v8-GitFetch: refs/heads/centos-7-aarch64
+arm64v8-GitCommit: d8521aa559c767d815e9bb05f7d05ea8ab781930
+Architectures: amd64, arm64v8
 
 Tags: centos6, 6
 GitFetch: refs/heads/CentOS-6