babel-english not auto-installed when rendering PDF with lang: en

[cderv]

Rendering a PDF with lang: en fails because babel-english is not automatically detected and installed.

---
title: title
format: pdf
lang: en
---

This is a test document.

Error:

Package babel Error: Unknown option 'english'.

Other LaTeX packages (e.g., koma-script, caption) are correctly auto-installed during rendering, but babel language support packages are not detected.

Workaround: tlmgr install babel-english

Dockerfile for reproduction

FROM rocker/r-ver:4.5.2

# Install system dependencies
RUN apt-get update && apt-get install -y \
    wget \
    curl \
    gdebi-core \
    perl \
    && rm -rf /var/lib/apt/lists/*

# Install tinytex R package and TinyTeX-1 bundle
RUN R -e "install.packages('tinytex', repos = 'https://cloud.r-project.org')" && \
    R -e "tinytex::install_tinytex(bundle = 'TinyTeX-1')"

# Add TinyTeX to PATH
ENV PATH="/root/.TinyTeX/bin/x86_64-linux:${PATH}"

# Install Quarto
ARG QUARTO_VERSION=1.8.25
RUN wget https://github.com/quarto-dev/quarto-cli/releases/download/v${QUARTO_VERSION}/quarto-${QUARTO_VERSION}-linux-amd64.deb && \
    gdebi --non-interactive quarto-${QUARTO_VERSION}-linux-amd64.deb && \
    rm quarto-${QUARTO_VERSION}-linux-amd64.deb

# Verify installations
RUN quarto --version
RUN R --version
RUN R -e "tinytex::tlmgr_version()"

# Create working directory
WORKDIR /test

# Create test.qmd file
RUN cat > test.qmd <<'EOF'
---
title: title
format: pdf
lang: en
---

This is a test document.
EOF

# Default command: demonstrate the failure and the workaround
CMD ["sh", "-c", "\
    echo '=== Attempting to render (should fail with babel error) ===' && \
    quarto render test.qmd --to pdf || echo 'Render failed as expected' && \
    echo '' && \
    echo '=== Installing babel-english workaround ===' && \
    tlmgr install babel-english && \
    echo '' && \
    echo '=== Rendering again (should succeed) ===' && \
    quarto render test.qmd --to pdf && \
    echo '' && \
    echo 'Success! PDF created after installing babel-english'"]

docker build -t quarto-babel-test .
docker run --rm quarto-babel-test

Found while working on pkgdown tests - affects Linux and macOS CI.

---

Note: Should check if the tinytex R package with Rmd documents correctly finds and auto-installs babel-english, to determine if this is Quarto-specific or a broader TinyTeX detection issue.

Here is the log file

test.log

[cderv]

Fixing first in tinytex before porting to Quarto

• Detect babel language files from newer error format rstudio/tinytex#476