ci: add nightly performance metrics

[mattstam]

Runs a GH actions self-hosted runner that produces a CSV artifact everyday to measure performance:

program,hashfn,shard_size,cycles,speed,execution_duration,prove_duration,verify_duration
fibonacci,poseidon,262144,1649654,46748.10612482976,0.079974542,35.288146125,0.585449792
fibonacci,poseidon,524288,1649654,43415.63522158116,0.086546708,37.996772167,0.377692166
fibonacci,blake3,262144,1649654,47154.4527526936,0.079041375,34.984055666,0.555750625
fibonacci,blake3,524288,1649654,40895.008680858744,0.086139042,40.338761458,0.349967916
fibonacci,keccak256,262144,1649654,44988.47826661718,0.08991225,36.668366292,0.571846375
fibonacci,keccak256,524288,1649654,37968.74227236251,0.078972792,43.447686209,0.360178958
ssz-withdrawals,poseidon,262144,6797245,38756.49853779125,0.78822925,175.383361667,2.508384042
...