ci: run fresh-install workflows only in the upstream repo #473

Job	Run time
cross-build aarch64-linux-musl (mcpp + xlings)	6m 36s
mingw-cross linux→windows (build + wine run)	5m 5s
windows→linux cross-build (windows host)	5m 50s
windows→linux artefact really runs (linux)	6s
	17m 37s

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