add GHA CD via Dockerhub

Dockerfile

@@ -0,0 +1,22 @@
+ARG DOCKER_BASE_IMAGE
+FROM $DOCKER_BASE_IMAGE
+ARG VCS_REF
+ARG BUILD_DATE
+LABEL \
+    maintainer="https://ocr-d.de/kontakt" \
+    org.label-schema.vcs-ref=$VCS_REF \
+    org.label-schema.vcs-url="https://github.com/qurator-spk/sbb_binarization" \
+    org.label-schema.build-date=$BUILD_DATE
+
+WORKDIR /build/sbb_binarization
+COPY setup.py .
+COPY ocrd-tool.json .
+COPY sbb_binarize ./sbb_binarize
+COPY requirements.txt .
+COPY README.md .
+COPY Makefile .
+RUN make install
+RUN rm -rf /build/sbb_binarization
+
+WORKDIR /data
+VOLUME ["/data"]