Add subprocess agent to avoid hitting docker-related issues (#86) #296

Job	Run time
Cargo checks	35s
Build server (macOS) (aarch64-apple-darwin)	1m 12s
Build server (aarch64-unknown-linux-gnu)	2m 2s
Build server (macOS) (x86_64-apple-darwin)	50s
Tests on Python 3.8	3m 59s
Build server (x86_64-unknown-linux-gnu)	2m 3s
Tests on Python 3.9	3m 42s
Build server (aarch64-unknown-linux-musl)	1m 59s
Tests on Python 3.10	3m 13s
Build server (armv7-unknown-linux-musleabi)	1m 56s
Build server (i686-unknown-linux-musl)	1m 53s
Tests on Python 3.11	3m 19s
Build server (x86_64-unknown-linux-musl)	2m 9s
Tests on Python 3.12	3m 27s
Build server (i686-pc-windows-gnu)	2m 16s
Tests on Python pypy3.9	7m 29s
Build server (x86_64-pc-windows-gnu)	2m 2s
Tests on Python pypy3.10	7m 55s
	52m 1s

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