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Add option to start http server for profiling (#323)

Browse source 
https://rafallorenz.com/go/go-profiling-http-service-with-pprof-and-expvar/
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/323
Co-authored-by: crapStone <me@crapstone.dev>
Co-committed-by: crapStone <me@crapstone.dev>
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crapStone 2024-04-30 19:50:03 +00:00 • committed by crapStone
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README.md
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@ -124,3 +124,18 @@ now these pages should work:
- <https://momar.localhost.mock.directory:4430/ci-testing/>
- <https://momar.localhost.mock.directory:4430/pag/@master/>
- <https://mock-pages.codeberg-test.org:4430/README.md>
### Profiling
> This section is just a collection of commands for quick reference. If you want to learn more about profiling read [this](https://go.dev/doc/diagnostics) article or google `golang profiling`.
First enable profiling by supplying the cli arg `--enable-profiling` or using the environment variable `EENABLE_PROFILING`.
Get cpu and mem stats:
```bash
go tool pprof -raw -output=cpu.txt 'http://localhost:9999/debug/pprof/profile?seconds=60' &
curl -so mem.txt 'http://localhost:9999/debug/pprof/heap?seconds=60'
```
More endpoints are documented here: <https://pkg.go.dev/net/http/pprof>