I receive Invalid cache mounts on this Dockerfile but I am not sure why, I am following the Railway docs exactly. Any help would be greatly appreciated, thanks.

```# syntax=docker/dockerfile:1

Comments are provided throughout this file to help you get started.

If you need more help, visit the Dockerfile reference guide at

https://docs.docker.com/go/dockerfile-reference/

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ARG PYTHONVERSION=3.11.4 FROM python:${PYTHONVERSION}-slim as base

Prevents Python from writing pyc files.

ENV PYTHONDONTWRITEBYTECODE=1

Keeps Python from buffering stdout and stderr to avoid situations where

the application crashes without emitting any logs due to buffering.

ENV PYTHONUNBUFFERED=1

Install custom dependencies for pypandoc and weasyprint.

RUN apt-get update \
&& apt-get install -y --no-install-recommends \
pandoc \
texlive \
lmodern \
libpango-1.0-0 \
libpangoft2-1.0-0 \
libharfbuzz-subset0 \
libjpeg-dev \
libopenjp2-7-dev \
libffi-dev \
&& apt-get clean \
&& rm -rf /var/lib/apt/lists/*

WORKDIR /app

Create a non-privileged user that the app will run under.

See https://docs.docker.com/go/dockerfile-user-best-practices/

ARG UID=10001
RUN adduser \
--disabled-password \
--gecos "" \
--home "/nonexistent" \
--shell "/sbin/nologin" \
--no-create-home \
--uid "${UID}" \
appuser

Download dependencies as a separate step to take advantage of Docker's caching.

Leverage a cache mount to /root/.cache/pip to speed up subsequent builds.

Leverage a bind mount to requirements.txt to avoid having to copy them into

into this layer.

RUN --mount=type=cache,id=s/d5f99fa7-4033-4d6f-a46c-46ae0524ae87-/root/.cache/pip,target=/root/.cache/pip \
--mount=type=bind,source=requirements.txt,target=requirements.txt \
python -m pip install -r requirements.txt

Switch to the non-privileged user to run the application.

USER appuser

Copy the source code into the container.

COPY . .

Expose the port that the application listens on.

EXPOSE 8000

Run the application.

CMD hypercorn main:app --bind [::]:8000
```