bug#51506: Add --quiet option to guix-install.sh

I can't cache the docker step to perform guix-install.sh, because it requires a user input which causes the `docker build -t guix:latest path/to/directory/with/Dockerfile` to ERR1.

Proposing to add command line option `--quiet` for the installer to not ask

Relevant dockerfile:

```dockerfile

#@ All rights reserved (C) Jacob Hrbek <rsa4096/0x31AE4020956E0A9A> in 30/10/2021-EU 01:22:40 UTC
# TODO(Krey): Set as FLOSS once finished

###!!! HALTED(Krey): The guix-install.sh requires an interactive shell blocking the deployment

# 30/10/2021-EU 01:44:14 UTC

FROM debian:bullseye-20211011-slim

LABEL Description="Minimal Debian Linux Image with GUIX package manager designed for testing"

# 30/10/2021-EU 01:24:54 UTC

LABEL Version="30102021012454"

ENV DEBIAN_FRONTEND="noninteractive"

# OUTSOURCED(Krey): Guix's official way to install the package manager on non-GUIX system is using https://git.savannah.gnu.org/cgit/guix.git/plain/etc/guix-install.sh

# 30/10/2021-EU 01:24:54 UTC

ENV guixInstall_commit="e4ed0b3969ddbe44347c468c96ccfa057b2dd256"

RUN true \

&& apt-get update \

&& apt-get install --yes --quiet --no-install-recommends \

wget \

gnupg \

xz-utils \

# NOTE(Krey): We need this otherwise wget will fail with `ERROR: The certificate of '' is not trusted`

ca-certificates \

&& wget "https://git.savannah.gnu.org/cgit/guix.git/plain/etc/guix-install.sh?id=$guixInstall_commit" -O guix-install.sh \

# Add guix-install dependencies

&& chmod +x guix-install.sh \

&& sh guix-install.sh \

&& apt-get remove --yes \

wget \

gnupg \

xz-utils \

&& apt-get autoremove --yes \

&& apt-get clean --yes \

&& rm -rf \

/var/cache/debconf/* \

/var/lib/apt/lists/* \

/tmp/* \

/var/tmp/*
```

From:	Jacob Hrbek
Subject:	bug#51506: Add --quiet option to guix-install.sh
Date:	Sat, 30 Oct 2021 02:45:53 +0000