fix: include quarto in container

Dockerfile

@@ -1,10 +1,20 @@
 FROM node:26-trixie-slim@sha256:a1d9d671994fc2d26e297ac56b4b1522a8bc7fa71c43b14cd1b1fe6c5116f7dc
 
+# OS packages used to fetch sources and deploy output
 RUN apt-get update \
  && apt-get install -y --no-install-recommends \
       git rsync curl ca-certificates \
  && rm -rf /var/lib/apt/lists/*
 
-ENV PIXI_VERSION=0.71.1
-RUN curl -fsSL https://pixi.sh/install.sh | bash
-ENV PATH="/root/.pixi/bin:${PATH}"
+# Quarto setup.
+ARG QUARTO_VERSION=1.9.38
+ARG QUARTO_SHA256=ea8c897368791ad9f200010c087ea3111b2e556b12a960487dd4e216902aa102
+
+RUN curl -fsSL -o /tmp/quarto.tar.gz \
+      "https://github.com/quarto-dev/quarto-cli/releases/download/v${QUARTO_VERSION}/quarto-${QUARTO_VERSION}-linux-amd64.tar.gz" \
+ && echo "${QUARTO_SHA256}  /tmp/quarto.tar.gz" | sha256sum -c - \
+ && mkdir -p /opt/quarto/${QUARTO_VERSION} \
+ && tar -xzf /tmp/quarto.tar.gz -C /opt/quarto/${QUARTO_VERSION} --strip-components=1 \
+ && ln -s /opt/quarto/${QUARTO_VERSION}/bin/quarto /usr/local/bin/quarto \
+ && rm /tmp/quarto.tar.gz \
+ && quarto --version