Matrix Build of MP-SPDZ CowGear CRG for CPU architectures

[strieflin]

MP-SPDZ makes uses of special instruction sets, when available, e.g., AVX. The target platform has to be specified at build time. To support the most important deployment targets, we need to build the CRG(s) using a matrix build. One has to investigate which platforms to support (local, cloud, etc.) and whether we can provide a default generic one that uses only basic optimizations and thus runs "everywhere". We also have to understand, how to select the right image automatically, when deploying or, if that is not possible, how the deployment can be made customizable in that aspect.

[github-actions]

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