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release.yml: no CHANGELOG section for the version stops the release, … #2010

Job	Run time
integration: mcpp builds & runs xlings	10m 26s
toolchain: gcc (cold self-host)	11m 2s
toolchain: musl + llvm	9m 39s
examples: the curriculum builds	11m 9s
build + unit tests (linux x86_64, self-host)	19m 23s
	1h 1m 39s