Release v2.12.0 #1367

Job	Run time
build (ubuntu-20.04, Debug, gcc)	1h 37m 12s
build (ubuntu-20.04, Debug, clang)	1h 27m 2s
build (ubuntu-20.04, RelWithDebInfo, gcc)	1h 5m 20s
build (ubuntu-20.04, RelWithDebInfo, clang)	41m 54s
build (ubuntu-20.04, script, gcc)	55m 16s
build (macos-latest, Debug, gcc)	1h 3m 54s
build (macos-latest, RelWithDebInfo, gcc)	32m 23s
build (macos-latest, script, gcc)	34m 54s
build (windows-latest, RelWithDebInfo, gcc)	59m 2s
build (windows-latest, script, gcc)	1h 0m 5s
	9h 57m 2s

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