🧪 Add MWE for Witiko/markdown#402

Dockerfile

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+FROM alpine:3.19.1
+
+RUN mkdir -p /data/context && mkdir -p /data/context/bin
+
+COPY context-linuxmusl-64/install.sh /data/context/install.sh
+COPY context-linuxmusl-64/bin/* /data/context/bin/
+
+RUN cd /data/context \
+  && chmod +x install.sh \
+  && ./install.sh
+
+ENV PATH=/data/context/tex/texmf-linuxmusl-64/bin:$PATH
+
+# Install Markdown package
+RUN apk add --no-cache wget \
+  && cd /data/context \
+  && wget -4 https://github.com/Witiko/markdown/releases/download/3.4.1/markdown.zip \
+  && unzip markdown.zip \
+  && mkdir -p tex/texmf-modules \
+  && unzip markdown.tds.zip -d tex/texmf-modules \
+  && context --generate \
+  && rm -rf markdown markdown.zip markdown.tds.zip \
+  && apk del --no-cache wget
+
+RUN addgroup -g 1000 context \
+  && adduser -u 1000 -G context -D context
+
+USER context
+WORKDIR /home/context

README.md

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+# MWE for [Witiko/markdown issue 402](https://github.com/Witiko/markdown/issues/402)
+
+I've uploaded the built image on Docker Hub for your convinience, but feel free to build it locally if you want (I've included the [`Dockerfile`](Dockerfile)).
+
+Run with:
+
+```shell
+docker-compose up
+```
+
+You can check the input and output files in [`compile`](compile) folder.
+
+Compiling without use of markdown package runs without any issues.
+
+🙏🏻 Thank you in advance!

compile/index.md

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+# Test heading
+
+1. First item
+2. Second item

compile/index.tex

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+\usemodule[t][markdown]
+
+\starttext
+\markdownInput{index.md}
+\stoptext