Build & test

Remove gitlab configuration files as they're useless on GitHub #21

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Run time

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Job	Run time
build (BUILD_CLANG)	2m 2s
build (BUILD_GCC)	3m 34s
build (CLANG)	1m 54s
build (GCC)	1m 59s
build (GCC_ASAN_UBSAN)	1m 18s
	10m 47s