Nix-build-task: A reusable Concourse task for building Nix derivations

My latest diversion may be of interest to any Concourse users here.

In a concourse pipeline, “tasks” are each run in separate containers, and a significant frustration is having to grant tasks privileged: true to be able to build a container image in your pipeline. This is where pkgs.dockerTools etc. have something to bring to the table.

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