Check core submodule version is consistent with base image core version

[kba]

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ocrd/core-cuda:v2.65.0 inconsistent with core version v2.65.0-1-gcc6ea575

which is good, but I update core in this PR as well to make sure it won't if all is set up properly.

Ah, but of course there is a catch. The check won't work if we derive from a non-versioned Docker base image such as ocrd/core:minimum-cuda.

I still think the check is a good idea and will open an issue for it but comment it out for now because we really need a new release urgently.

Originally posted by @kba in #442 (comment)