tests: split out image building into it's own job to speed up ci #5945
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Previously, we would build the dokku package and install it in the same step. While the package building was relatively quick, because of our multi-architecture support, we would end up spending a large amount of time waiting for arm/arm64 images to build.
This change splits those builds out, allowing unit tests to start much quicker and each platform to be tested in parallel.