And… I misread the version in the topic title. You want 0.40.3 not 0.43…
[build.environment]
HUGO_VERSION_DOWNLOAD = "0.40.3"
TZ = "Europe/Oslo"
[build]
publish = "public"
command = """\
mkdir -p "${HOME}/.local/bin" && \
curl -sLJO "https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION_DOWNLOAD}/hugo_${HUGO_VERSION_DOWNLOAD}_Linux-64bit.tar.gz" && \
tar -C "${HOME}/.local/bin" -xf "hugo_${HUGO_VERSION_DOWNLOAD}_Linux-64bit.tar.gz" && \
rm "hugo_${HUGO_VERSION_DOWNLOAD}_Linux-64bit.tar.gz" && \
git config core.quotepath false && \
export PATH="${HOME}/.local/bin:${PATH}" && \
hugo version && \
hugo --gc --baseURL "${URL}"
"""
Works great.