A dockerfile using `ubuntu` instead of `python` as base image currently
silently fails to install.
```dockerfile
FROM ubuntu
RUN apt-get update && apt-get install -y curl --no-install-recommends
RUN curl -LsSf https://astral.sh/uv/install.sh | sh
RUN uv --version
```
```console
$ docker buildx build --progress plain --no-cache .
[...]
#6 [3/4] RUN curl -LsSf https://astral.sh/uv/install.sh | sh
#6 0.144 curl: (77) error setting certificate file: /etc/ssl/certs/ca-certificates.crt
#6 DONE 0.2s
#7 [4/4] RUN uv --version
#7 0.113 /bin/sh: 1: uv: not found
#7 ERROR: process "/bin/sh -c uv --version" did not complete successfully: exit code: 127
```
There's two underlying problems: Pipefail, and missing
`ca-certificates`.
In most shells, the source of a pipe erroring doesn't fail the entire
command, so `curl -LsSf https://astral.sh/uv/install.sh | sh` passes
even if the curl part fails. In bash, you can prefix the command with
`set -o pipefail &&` to change this behavior. But in the `ubuntu` docker
container, dash is the default shell, not bash. dash doesn't have a
pipefail option (in the version in ubuntu), so the [best
practice](https://docs.docker.com/build/building/best-practices/#using-pipes)
is `RUN ["/bin/bash", "-c", "set -o pipefail && curl -LsSf
https://astral.sh/uv/install.sh | sh"]`. That's not very readable, so
i'm going for `RUN curl -LsSf https://astral.sh/uv/install.sh >
/tmp/uv-installer.sh && sh /tmp/uv-installer.sh && rm
/tmp/uv-installer.sh` instead.
```dockerfile
FROM ubuntu
RUN apt-get update && apt-get install -y curl --no-install-recommends
RUN curl -LsSf https://astral.sh/uv/install.sh > /tmp/uv-installer.sh && sh /tmp/uv-installer.sh && rm /tmp/uv-installer.sh \
RUN uv --version
```
```console
$ docker buildx build --progress plain --no-cache .
[...]
#6 [3/3] RUN curl -LsSf https://astral.sh/uv/install.sh > /tmp/uv-installer.sh && sh /tmp/uv-installer.sh && rm /tmp/uv-installer.sh RUN uv --version
#6 0.179 curl: (77) error setting certificate file: /etc/ssl/certs/ca-certificates.crt
#6 ERROR: process "/bin/sh -c curl -LsSf https://astral.sh/uv/install.sh > /tmp/uv-installer.sh && sh /tmp/uv-installer.sh && rm /tmp/uv-installer.sh RUN uv --version" did not complete successfully: exit code: 77
```
The source for this error is `ca-certificates` missing, which is a
recommended package. We need to drop `--no-install-recommends` and the
installation passes again.
