Use self-hosted linux runner #622

Job	Run time
clippy	36s
Rustfmt	17s
Check	27s
coverage	2m 31s
Test Suite (self-hosted, linux, x64, intel, stable, self-hosted-linux-intel)	1m 27s
Test Suite (self-hosted, linux, arm64, --cfg=aes_armv8, nightly-2023-06-27)	3m 8s
Test Suite (self-hosted, macos, arm64, --cfg=aes_armv8, nightly-2023-06-27)	1m 13s
Test Suite (macos-latest, stable)	3m 50s
Test Suite (windows-2019, stable)	3m 5s
Build library (ubuntu-latest, libpost.so, libpost.a, linux, stable)	1m 13s
Build library (self-hosted, linux, arm64, libpost.so, libpost.a, --cfg=aes_armv8, linux-arm64, ni...	2m 36s
Build library (self-hosted, macos, arm64, libpost.dylib, libpost.a, --cfg=aes_armv8, macos-m1, ni...	1m 27s
Build library (macos-latest, libpost.dylib, libpost.a, macos, stable)	3m 19s
Build library (windows-2019, post.dll, post.lib, windows, stable)	6m 11s
Publish release	0s
	31m 20s

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