feat: allow threads as input

[ven-k]

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[codecov]

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[IanButterworth]

auto isn't the julia default unfortunately, so this will need to be a bit cleverer. Basically not set the arg by default

[ven-k]

Ah, yeah.
This might suffice:
default: "${JULIA_NUM_THREADS:=1}"

Or I can do a

if [[ -n ${{ input.threads }} ]]; then
   julia ... --threads ${{ input.threads }} -e ...
else
   julia ...
fi

[IanButterworth]

Better to populate a var for the threads arg and interpolate it in, as if any other args need the same behavior different if paths for the top level cmd would make for a mess of if statements

[IanButterworth]

Sorry, I meant a different approach like threads_arg = inputs.threads == "default" ? "" : "--threads=${{ inputs.threads}}

Then interpolate threads_arg into the cmd, making use of it being empty to avoid setting the arg

[ven-k]

Looks like --threads wasn't allowed in Julia 1.0.5.

I suppose, we would want to avoid a version based statement. So, instead of this, setting JULIA_NUM_THREADS in env is the best way.