merge some layers when copying the files into the container

[AEnterprise]

merge some file layers so we don't make a layer just to change file ownership, just assign it the right permissions in the same layer

also simplify changing the manifest example into the actual manifest. we know for a fact it won't exist so no need to test for it. this also means that if for some reason there suddenly is a manifest, the build will fail and we can evaluate what the correct one is at that time, instead of it invisibly changing and potentially breaking