fix(installer): set UV_NO_CONFIG=1 to avoid permission denied under sudo -u

When the installer is run via , uv resolves config file
paths against the process owner's (root) home directory rather than the
effective user's, causing a Permission denied error when trying to read
/root/uv.toml.

Setting UV_NO_CONFIG=1 prevents uv from discovering any config files
(uv.toml, pyproject.toml) during installation, which is the correct
behavior for a bootstrap script that manages its own environment.

Fixes #21269

scripts/install.sh

@@ -28,6 +28,10 @@ if [ -n "${PYTHONHOME:-}" ]; then
     unset PYTHONHOME
 fi
 
+# Prevent uv from discovering config files (uv.toml, pyproject.toml) from the
+# wrong user's home directory when running under sudo -u <user>.  See #21269.
+export UV_NO_CONFIG=1
+
 # Colors
 RED='\033[0;31m'
 GREEN='\033[0;32m'