Trigger benchmarking with Bors commands

[yebai]

Turing's benchmarking is not used often at the moment. I think part of the reason is that the benchmarking process is a bit complicated, even with Nanosoldiers. Would it make sense to try to

• trigger benchmarking for PRs using bors bot, with a customised command (see below)
• replace Nanosoldier with PkgBenchmark , which is designed specifically for track performance changes of Julia packages.

Ps: some references:

• bors try arguments: these arguments are stored as commit message, and can be extracted by the benchmarking script.
• perhaps: bors try --benchmarking?

[devmotion]

Maybe https://github.com/tkf/BenchmarkCI.jl could be useful. The trigger of the Github action could be adjusted to whatever we think would be suitable.

[yebai]

Closed in favour of TuringLang/DynamicPPL.jl#346