feat: add warn-prebuilt feature

[mkroening]

Once we have a warning, we can go ahead with distributing prebuilt libraries.

[mkroening]

I was unsure whether to also add a suggestion to build the kernel:

This is a prebuilt Hermit kernel. Please consider building a custom kernel.

[github-actions]

Benchmark Results

Benchmark	Current: 3236b48	Previous: 0d8ebd6	Performance Ratio
startup_benchmark Build Time	125.09 s	126.17 s	0.99
startup_benchmark File Size	0.91 MB	0.91 MB	1.00
Startup Time - 1 core	0.92 s (±0.02 s)	0.97 s (±0.02 s)	0.95
Startup Time - 2 cores	0.93 s (±0.02 s)	0.96 s (±0.02 s)	0.97
Startup Time - 4 cores	0.94 s (±0.03 s)	0.95 s (±0.02 s)	0.99
multithreaded_benchmark Build Time	121.72 s	127.50 s	0.95
multithreaded_benchmark File Size	0.97 MB	0.97 MB	1.00
Multithreaded Pi Efficiency - 2 Threads	2.32 % (±11.11 %)	2.86 % (±13.75 %)	0.81
Multithreaded Pi Efficiency - 4 Threads	1.83 % (±8.80 %)	1.55 % (±7.46 %)	1.18
Multithreaded Pi Efficiency - 8 Threads	0.88 % (±4.21 %)	0.83 % (±4.01 %)	1.05
micro_benchmarks Build Time	121.14 s	128.14 s	0.95
micro_benchmarks File Size	0.98 MB	0.98 MB	1.00
Scheduling time - 1 thread	2.71 ticks (±12.99 ticks)	2.80 ticks (±13.42 ticks)	0.97
Scheduling time - 2 threads	1.59 ticks (±7.63 ticks)	1.66 ticks (±7.98 ticks)	0.96
Micro - Time for syscall (getpid)	0.15 ticks (±0.74 ticks)	0.16 ticks (±0.75 ticks)	0.98
Memcpy speed - (built_in) block size 4096	1395.09 MByte/s (±6696.43 MByte/s)	1775.57 MByte/s (±8522.73 MByte/s)	0.79
Memcpy speed - (built_in) block size 1048576	696.99 MByte/s (±3345.53 MByte/s)	728.52 MByte/s (±3496.89 MByte/s)	0.96
Memcpy speed - (built_in) block size 16777216	192.77 MByte/s (±925.28 MByte/s)	214.55 MByte/s (±1029.82 MByte/s)	0.90
Memset speed - (built_in) block size 4096	1846.15 MByte/s (±8861.54 MByte/s)	1558.44 MByte/s (±7480.52 MByte/s)	1.18
Memset speed - (built_in) block size 1048576	1025.61 MByte/s (±4922.95 MByte/s)	1044.88 MByte/s (±5015.41 MByte/s)	0.98
Memset speed - (built_in) block size 16777216	643.67 MByte/s (±3089.62 MByte/s)	919.64 MByte/s (±4414.26 MByte/s)	0.70
Memcpy speed - (rust) block size 4096	1212.12 MByte/s (±5818.18 MByte/s)	1081.08 MByte/s (±5189.19 MByte/s)	1.12
Memcpy speed - (rust) block size 1048576	732.83 MByte/s (±3517.58 MByte/s)	729.78 MByte/s (±3502.95 MByte/s)	1.00
Memcpy speed - (rust) block size 16777216	193.52 MByte/s (±928.88 MByte/s)	213.59 MByte/s (±1025.25 MByte/s)	0.91
Memset speed - (rust) block size 4096	1791.04 MByte/s (±8597.01 MByte/s)	1558.44 MByte/s (±7480.52 MByte/s)	1.15
Memset speed - (rust) block size 1048576	857.74 MByte/s (±4117.17 MByte/s)	991.57 MByte/s (±4759.54 MByte/s)	0.87
Memset speed - (rust) block size 16777216	643.95 MByte/s (±3090.95 MByte/s)	905.39 MByte/s (±4345.86 MByte/s)	0.71
alloc_benchmarks Build Time	124.17 s	126.27 s	0.98
alloc_benchmarks File Size	0.97 MB	0.97 MB	1.00
Allocations - Allocation success	2.00 % (±13.86 %)	2.00 % (±13.86 %)	1
Allocations - Deallocation success	1.40 % (±9.67 %)	1.41 % (±9.76 %)	0.99
Allocations - Pre-fail Allocations	2.00 % (±13.86 %)	2.00 % (±13.86 %)	1
Allocations - Average Allocation time	246.79 Ticks (±1710.15 Ticks)	245.86 Ticks (±1703.72 Ticks)	1.00
Allocations - Average Allocation time (no fail)	246.79 Ticks (±1710.15 Ticks)	245.86 Ticks (±1703.72 Ticks)	1.00
Allocations - Average Deallocation time	17.05 Ticks (±118.17 Ticks)	16.99 Ticks (±117.72 Ticks)	1.00
mutex_benchmark Build Time	123.54 s	120.28 s	1.03
mutex_benchmark File Size	0.98 MB	0.98 MB	1.00
Mutex Stress Test Average Time per Iteration - 1 Threads	0.26 ns (±1.80 ns)	0.28 ns (±1.94 ns)	0.93
Mutex Stress Test Average Time per Iteration - 2 Threads	0.32 ns (±2.22 ns)	0.34 ns (±2.36 ns)	0.94

This comment was automatically generated by workflow using github-action-benchmark.