tests: add an env variable bench for testing

[art049]

No description provided.

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #89 will degrade performances by 5.36%

_{Comparing cod-658-i-cannot-pass-an-env-variable-to-the-thing-running (76eef18) with time-scale-benches (b166c4d)}

Summary

⚡ 3 improvements
❌ 3 regressions
✅ 162 untouched benchmarks
🆕 1 new benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	bench_array1[42]	1 µs	1.1 µs	-5.36%
⚡	bench_array1[4]	154.4 ns	125.3 ns	+23.28%
❌	bench_array2[42]	1 µs	1.1 µs	-5.36%
⚡	bench_array2[4]	154.4 ns	125.3 ns	+23.28%
❌	init_array[42]	1 µs	1.1 µs	-5.36%
⚡	init_array[4]	183.6 ns	154.4 ns	+18.88%
🆕	print_env_hello	N/A	8 µs	N/A

[codspeed-hq]

CodSpeed Walltime Performance Report

Merging #89 will degrade performances by 20.25%

_{Comparing cod-658-i-cannot-pass-an-env-variable-to-the-thing-running (76eef18) with time-scale-benches (b166c4d)}

Summary

⚡ 9 improvements
❌ 6 regressions
✅ 135 untouched benchmarks
🆕 1 new benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	build_vec	170 ns	205 ns	-17.07%
⚡	large_drop	183.9 µs	168.7 µs	+9.01%
⚡	large_setup	12 ns	10 ns	+20%
⚡	from_elem[2048]	243 ns	229 ns	+6.11%
⚡	bench_array1[10]	5.2 µs	4.9 µs	+4.37%
⚡	bench_array2[10]	5.2 µs	4.9 µs	+4.37%
⚡	init_array[1000]	6.9 µs	1.8 µs	×3.9
🆕	print_env_hello	N/A	2 µs	N/A
⚡	recursive_memoized[BTreeMap<u64, u64>, 20]	3.5 µs	1.8 µs	+98.63%
❌	graph_coloring[5]	4 µs	4.2 µs	-5.39%
❌	hamiltonian_cycle[6]	5.6 µs	5.8 µs	-3.3%
❌	n_queens_solver[5]	8.7 µs	9.1 µs	-4.23%
❌	permutations[7]	766.6 µs	796.5 µs	-3.76%
⚡	sleep_100ns	37.2 µs	25.5 µs	+45.79%
⚡	sleep_100us	130.5 µs	114 µs	+14.42%
❌	sleep_1ns	21.1 µs	26.5 µs	-20.25%