GHA: initial workflow #10

Job	Run time
Clang-tidy	36m 16s
Regression	26s
Create Changelog	5s
Build (windows, dynamic, Release)	36m 40s
Build (windows, static, Release)	37m 44s
Build (macos, dynamic, Release)	35m 24s
Build (macos, dynamic, Debug)	34m 3s
Build (macos, static, Release)	34m 36s
Build (macos, static, Debug)	34m 45s
Build (linux, dynamic, Release)	33m 9s
Build (linux, dynamic, Debug)	32m 57s
Build (linux, static, Release)	32m 35s
Test Installer	0s
	5h 48m 40s

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