Move build config into a subfolder #582

Job	Run time
Build & test (linux, x64, ubuntu-22.04)	5m 27s
Build & test (mac, x64, macos-15-intel)	12m 57s
Build & test (linux, arm64, ubuntu-24.04-arm)	6m 2s
Build & test (mac, arm64, macos-14)	6m 31s
Build & test (windows, x64, windows-2022)	5m 47s
Publish a release	0s
Submit to WinGet repository	0s
	36m 44s

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