workflows: run without condition on changed paths

To enable *required status checks / workflows* in the future, we'd like
to run all workflows unconditionally. Since those workflows are already
using cachix, the additional runs will be very cheap. Yes, we'll run
additional jobs, but that will be temporary only, see next commits.

The immediate upside is, that we're not going to accidentally miss some
of the paths that would cause rebuilds as we did in the past.

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