ci: Delete dockerfile, move to common scripts, consolidate gcc/clang #759
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The Dockerfile is problematic since we can't update it atomically.
I also really dislike reliance on the Hub.
Further, I think rather than caching our build deps, we should be
caching RPMs in CI. And we should be using rpm-ostree at some point
to assemble filesystem trees faster.
Also, consolidate the clang to be serial with gcc, since while we lose a tiny
bit of parallelism, it's not really worth its own context right now.