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rust: Preallocate the returned `Vec` in `utils::files::relativize_path`...
rust: Preallocate the returned `Vec` in `utils::files::relativize_path` Profiling `rhg files > /dev/null` on an old snapshot of mozilla-central (with `perf` and the Firefox Profiler: https://github.com/firefox-devtools/profiler/blob/main/docs-user/guide-perf-profiling.md) showed non-trivial time spend in this function and in `realloc`. This change makes the wall-clock time for that process on my machine go from ~190 ms to ~150 ms. Differential Revision: https://phab.mercurial-scm.org/D10199

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ubuntu.template
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FROM ubuntu:%CODENAME%
RUN groupadd -g 1000 build && \
useradd -u 1000 -g 1000 -s /bin/bash -d /build -m build
ARG DEBIAN_FRONTEND=noninteractive
ENV TZ=%TZ%
RUN apt-get update && apt-get install -y \
build-essential \
debhelper \
devscripts \
dh-python \
less \
python \
python3-all \
python3-all-dev \
python3-docutils \
unzip \
zip