Make the builder and runtime OS versions match

We can't build the latest server on buster, but we were using "latest" so it actually was building on bullseye. Then we tried to run it on buster and it blew up. This locks both versions to bullseye so we're running on the same environment where we build.
27b3d11aa6Nathan Sobo committed on 9/13/2021, 8:03:00 PMparentc14ebb2
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