GHA: initial workflow #14

Job	Run time
Regression	12s
Create Changelog	2s
Build (windows, dynamic, Release)	38m 27s
Clang-tidy	35m 53s
Build (windows, static, Release)	35m 56s
Build (macos, dynamic, Release)	33m 17s
Build (macos, dynamic, Debug)	34m 2s
Build (macos, static, Release)	45m 38s
Build (macos, static, Debug)	34m 0s
Build (linux, dynamic, Release)	34m 16s
Build (linux, dynamic, Debug)	34m 1s
Build (linux, static, Release)	32m 39s
Test Installer	0s
	5h 58m 23s

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