Add trivial containerfile for building borg

Containerfile

@@ -0,0 +1,45 @@
+FROM docker.io/library/python:3.11 AS build
+
+RUN apt update --yes
+RUN apt install --yes \
+  libacl1-dev \
+  libacl1 \
+  libssl-dev \
+  liblz4-dev \
+  libzstd-dev \
+  libxxhash-dev \
+  build-essential \
+  pkg-config \
+  python3-pkgconfig \
+  libfuse3-dev
+
+RUN python -m pip install \
+  Cython==3.0.3 \
+  pkgconfig==1.5.5 \
+  --disable-pip-version-check \
+  --upgrade
+
+# remember to add borg user to fuse group in final container
+
+COPY . /source
+
+RUN cd /source/borgbackup && python -m pip wheel .[pyfuse3] \
+  --wheel-dir /wheels \
+  --prefer-binary \
+  --disable-pip-version-check
+
+
+FROM docker.io/library/python:3.11-slim AS final
+
+COPY --from=build /wheels /wheels
+
+RUN python -m pip install borgbackup[pyfuse3] \
+  --upgrade \
+  --pre \
+  --no-index \
+  --no-cache-dir \
+  --find-links /wheels \
+  --disable-pip-version-check && \
+  rm -rf /install/
+
+ENTRYPOINT ["/bin/bash"]