zimbatm 6597ff1349 ci: fix Travis CI builds ...

* run the ./build after setting the NIX_PATH. Previously the images
  were always generate with the system channel. Oops!
* pin the outer shell version to nixos-19.09. skopeo broke in unstable.
  also we don't need to force the system here, technically this could
  run on macOS.

2020-02-09 16:23:27 +01:00

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