GHA: initial workflow #8

Job	Run time
Clang-tidy	36m 24s
Create Changelog	3s
Regression	23s
Build (windows, dynamic, Release)	37m 6s
Build (windows, static, Release)	38m 4s
Build (macos, dynamic, Release)	34m 11s
Build (macos, dynamic, Debug)	34m 16s
Build (macos, static, Release)	35m 0s
Build (macos, static, Debug)	34m 28s
Build (linux, dynamic, Release)	33m 9s
Build (linux, dynamic, Debug)	32m 32s
Build (linux, static, Release)	32m 39s
Test Installer	0s
	5h 48m 15s

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