[RFC PATCH] dir: add discoverable local-only .gitlocalignore #29026

Job	Run time
config	9s
fuzz smoke test	1m 30s
win build	5m 34s
win+Meson build	5m 6s
static-analysis	5m 12s
documentation	7m 24s
sparse	3m 59s
osx-meson (macos-14)	42m 23s
osx-reftable (macos-14)	34m 53s
osx-gcc (macos-14)	36m 28s
osx-clang (macos-14)	43m 46s
rust-analysis	1m 51s
linux-leaks (ubuntu:rolling)	59m 41s
linux-breaking-changes (ubuntu:rolling)	24m 49s
linux32 (i386/ubuntu:20.04)	6h 0m 4s
linux-asan-ubsan (ubuntu:rolling)	1h 0m 36s
linux-reftable-leaks (ubuntu:rolling)	58m 14s
linux-meson (ubuntu:rolling)	24m 36s
almalinux-8 (almalinux:8)	15m 32s
win+VS build	0s
linux-musl-meson (alpine:latest)	22m 31s
linux-sha256 (ubuntu:rolling)	24m 59s
linux-reftable (ubuntu:rolling)	25m 33s
linux-TEST-vars (ubuntu:20.04)	24m 49s
fedora-breaking-changes-meson (fedora:latest)	20m 4s
debian-11 (debian:11)	22m 17s
win+VS test	0s
win+Meson test (8)	9m 35s
win+Meson test (2)	6m 48s
win+Meson test (9)	8m 47s
win+Meson test (3)	7m 49s
win+Meson test (4)	57m 52s
win+Meson test (6)	12m 7s
win+Meson test (7)	29m 20s
win+Meson test (0)	11m 19s
win+Meson test (5)	8m 51s
win+Meson test (1)	9m 24s
win test (9)	4m 52s
win test (8)	7m 41s
win test (5)	10m 4s
win test (0)	11m 45s
win test (6)	5m 56s
win test (2)	7m 9s
win test (3)	10m 10s
win test (1)	9m 2s
win test (4)	10m 37s
win test (7)	59m 39s
	20h 30m 47s

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