for-each-repo: work correctly in a worktree #26655

Job	Run time
config	8s
fuzz smoke test	1m 12s
win+VS build	-1s
documentation	6m 51s
win+Meson build	6m 28s
rust-analysis	1m 37s
sparse	3m 35s
static-analysis	5m 58s
osx-clang (macos-14)	17m 19s
win build	5m 8s
osx-meson (macos-14)	26m 46s
osx-reftable (macos-14)	21m 25s
osx-gcc (macos-14)	23m 30s
linux-breaking-changes (ubuntu:rolling)	14m 44s
win+VS test	0s
fedora-breaking-changes-meson (fedora:latest)	10m 51s
linux-meson (ubuntu:rolling)	14m 49s
linux32 (i386/ubuntu:focal)	11m 18s
linux-reftable (ubuntu:rolling)	15m 28s
linux-musl-meson (alpine:latest)	9m 2s
linux-sha256 (ubuntu:rolling)	12m 12s
almalinux-8 (almalinux:8)	11m 46s
linux-TEST-vars (ubuntu:20.04)	14m 49s
debian-11 (debian:11)	11m 6s
linux-reftable-leaks (ubuntu:rolling)	31m 52s
linux-leaks (ubuntu:rolling)	31m 10s
linux-asan-ubsan (ubuntu:rolling)	38m 9s
win+Meson test (5)	33s
win+Meson test (3)	44s
win+Meson test (7)	42s
win+Meson test (1)	43s
win+Meson test (4)	34s
win+Meson test (8)	31s
win+Meson test (2)	33s
win+Meson test (9)	1m 28s
win+Meson test (0)	32s
win+Meson test (6)	36s
win test (0)	6m 47s
win test (3)	5m 42s
win test (4)	10m 46s
win test (6)	6m 41s
win test (5)	7m 57s
win test (1)	7m 40s
win test (7)	6m 17s
win test (2)	9m 13s
win test (8)	7m 37s
win test (9)	11m 13s
	7h 14m 1s

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