[Step 2/3] Only add benchmark.yml

[miguelmaso]

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[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	93706a2...	main / 93706a2...
Constitutive models/Visco-elastic Ψ	0.0483 ± 0.029 ms	0.0479 ± 0.029 ms	1.01 ± 0.86
Constitutive models/Visco-elastic ∂Ψu	0.0612 ± 0.0026 ms	0.0612 ± 0.0028 ms	1 ± 0.062
Constitutive models/Visco-elastic ∂Ψuu	0.11 ± 0.025 ms	0.109 ± 0.019 ms	1.01 ± 0.29
Tensor algebra/δδ_λ_2d	30 ± 0 ns	30 ± 0 ns	1 ± 0
Tensor algebra/δδ_μ_2d	30 ± 0 ns	30 ± 0 ns	1 ± 0
time_to_load	2.48 ± 0.0053 s	2.49 ± 0.019 s	0.996 ± 0.0079

Memory benchmarks

	main	93706a2...	main / 93706a2...
Constitutive models/Visco-elastic Ψ	1.24 k allocs: 0.0782 MB	1.24 k allocs: 0.0782 MB	1
Constitutive models/Visco-elastic ∂Ψu	1.36 k allocs: 0.0904 MB	1.36 k allocs: 0.0904 MB	1
Constitutive models/Visco-elastic ∂Ψuu	2.31 k allocs: 0.155 MB	2.31 k allocs: 0.155 MB	1
Tensor algebra/δδ_λ_2d	0 allocs: 0 B	0 allocs: 0 B
Tensor algebra/δδ_μ_2d	0 allocs: 0 B	0 allocs: 0 B
time_to_load	0.151 k allocs: 11.5 kB	0.151 k allocs: 11.5 kB	1