caddyfile: Switch to slices.Equal for better performance

[bbaa-bbaa]

Fixes #6058

Switch to strings.Builder for better performance.
Converting []rune to string seems to be inefficient.
Or we can simply use slices.Equal from "golang.org/x/exp/slices".

(pprof) top10
Showing nodes accounting for 17.37s, 94.30% of 18.42s total
Dropped 126 nodes (cum <= 0.09s)
Showing top 10 nodes out of 37
      flat  flat%   sum%        cum   cum%
    10.65s 57.82% 57.82%     15.62s 84.80%  runtime.slicerunetostring
     4.87s 26.44% 84.26%      4.87s 26.44%  runtime.encoderune
     0.56s  3.04% 87.30%      1.78s  9.66%  runtime.scanobject
     0.28s  1.52% 88.82%      0.29s  1.57%  runtime.spanOf (inline)
     0.23s  1.25% 90.07%      0.23s  1.25%  runtime.heapBits.nextFast (inline)
     0.22s  1.19% 91.26%      0.51s  2.77%  runtime.findObject
     0.17s  0.92% 92.18%      0.17s  0.92%  runtime.(*gcBits).bitp (inline)
     0.15s  0.81% 93.00%      0.15s  0.81%  runtime.heapBitsForAddr
     0.13s  0.71% 93.70%      2.45s 13.30%  runtime.gcDrain
     0.11s   0.6% 94.30%      0.11s   0.6%  runtime.futex
`

[francislavoie]

Interesting 😅

Or we can simply use slices.Equal from "golang.org/x/exp/slices".

That would be fine too, if you prefer.

[bbaa-bbaa]

That would be fine too, if you prefer.

Switch to slices.Equal.

[francislavoie]

Thanks!