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Minimal base images such as the nvidia-l4t variants ship neither uv nor
pip. When a backend is installed onto a persistent /backends volume there,
`local-ai backends install` downloads the OCI layer fine but the follow-up
install.sh aborts at `uv venv` with "uv: command not found", leaving a
half-built backend with no in-container recovery path.
Add ensureUv(), called from ensureVenv() before any uv-based venv work.
When uv is absent (and not in USE_PIP mode) it bootstraps a private copy
into the backend's own directory (${EDIR}/uv-bin) using the same official
installer the base images use. The directory lives on the persistent
volume, so the download happens only once and survives image upgrades.
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Assisted-by: Claude:opus-4.8 [Claude Code]