The same SHA cannot be pushed twice to the staging registry. Because some images were
mirrored, their SHAs remained unchanged. This addresses this issue.
nginx expects to find its conf and logs folder locally, and fails if it cannot find them.
cd-ing into the the nginx folder solves this issue. This is a similar approach to the
echoserver image, which also uses nginx.
Adds the httpd, nginx, images that are used in tests.
Two different versions of nginx have to build, and thus, the have
different folders. An ALIAS file was added to nginx-new in order to
keep the same image name.