Aliases a project needs when it draws on the panel.

bb_nsk.add_display wires these into mix.exs as ordinary Mix tasks:

firmware: ["bb_nsk.prune_nifs", "firmware"],
test: ["bb_nsk.restore_nifs", "test"],
run: ["bb_nsk.restore_nifs", "run"]

Tasks rather than function references. An alias entry is either a task name or a function, and Igniter writes a function reference into mix.exs as a literal {:code, ...} tuple that Mix then rejects — but a task name is just a string, which needs nothing special from anybody.

Why they are needed

rustler_precompiled keeps every NIF it has ever downloaded in deps/emerge/priv/native, and Mix symlinks every build's emerge/priv at that one directory — _build/dev, _build/test and _build/trellis_dev alike. So the host's library and the board's share a directory, and each one's build breaks the other's:

• a host mix test leaves an x86_64 library where the firmware build can see it, and Nerves' release scrub rejects the whole image, naming the file rather than the cause;
• pruning it so the firmware builds then leaves the host with no library to load, and Emerge's on_load fails.

So the two are handled as a pair rather than one being fixed at the other's expense. Restoring costs about two seconds and comes out of rustler_precompiled's own cache rather than the network, and it only runs when the library is actually missing — which is only ever straight after a firmware build.

This lives in the library rather than being generated into mix.exs so that the workaround improves for everyone when it is improved at all.