feat: extract pdf from mp/pdf — initial libreshop/pdf

Source moved verbatim from mp/pdf/ on 2026-04-29; mp was the first
concrete adapter consuming the libreshop toolkit. Builds and publishes
git.librete.ch/libreshop/pdf on every main / v* push via the standard
.gitea/workflows/build.yml shared across libreshop components.

Dockerfile

@@ -0,0 +1,27 @@
+FROM rstropek/pandoc-latex:3.1
+
+RUN apk add --no-cache --update \
+    make \
+    python3 py-pip \
+    fontconfig ttf-freefont font-noto
+
+WORKDIR /app
+
+RUN tlmgr update --self
+RUN tlmgr install ragged2e xltxtra realscripts wallpaper eso-pic \
+    titlesec arydshln spreadtab enumitem xstring
+
+COPY ./requirements.txt /app/requirements.txt
+
+RUN pip install -r requirements.txt
+
+COPY ./data /app/data
+COPY ./src /app/src
+COPY ./makefile /app/makefile
+COPY ./docker-entrypoint.sh /app/docker-entrypoint.sh
+
+RUN chmod +x /app/docker-entrypoint.sh
+
+ENTRYPOINT ["/app/docker-entrypoint.sh"]
+
+EXPOSE 1111