🐛 Override $HOME in the container with /root

This is necessary to let `python -m site` locate the real install
directories.
This fixes #115 — the bug caused by GitHub passing the value of
`$HOME` from the host system that does not match the container's
expectations.

twine-upload.sh

@@ -11,6 +11,7 @@ set -Eeuo pipefail
 # NOTE: These variables are needed to combat GitHub passing broken env vars
 # NOTE: from the runner VM host runtime.
 # Ref: https://github.com/pypa/gh-action-pypi-publish/issues/112
+export HOME="/root"  # So that `python -m site` doesn't get confused
 export PATH="/usr/bin:${PATH}"  # To find `id`
 . /etc/profile  # Makes python and other executables findable
 export PATH="$(python -m site --user-base)/bin:${PATH}"