improve+extend dockerfile

Dockerfile

@@ -4,23 +4,40 @@ FROM $DOCKER_BASE_IMAGE
 ARG VCS_REF
 ARG BUILD_DATE
 LABEL \
-    maintainer="https://ocr-d.de/kontakt" \
+    maintainer="https://ocr-d.de/en/contact" \
     org.label-schema.vcs-ref=$VCS_REF \
     org.label-schema.vcs-url="https://github.com/qurator-spk/eynollah" \
-    org.label-schema.build-date=$BUILD_DATE
+    org.label-schema.build-date=$BUILD_DATE \
+    org.opencontainers.image.vendor="DFG-Funded Initiative for Optical Character Recognition Development" \
+    org.opencontainers.image.title="Eynollah" \
+    org.opencontainers.image.description="" \
+    org.opencontainers.image.source="https://github.com/qurator-spk/eynollah" \
+    org.opencontainers.image.documentation="https://github.com/qurator-spk/eynollah/blob/${VCS_REF}/README.md" \
+    org.opencontainers.image.revision=$VCS_REF \
+    org.opencontainers.image.created=$BUILD_DATE \
+    org.opencontainers.image.base.name=ocrd/core-cuda-tf2
 
 ENV DEBIAN_FRONTEND=noninteractive
+# set proper locales
 ENV PYTHONIOENCODING=utf8
-ENV XDG_DATA_HOME=/usr/local/share
+ENV LANG=C.UTF-8
+ENV LC_ALL=C.UTF-8
 
-WORKDIR /build-eynollah
-COPY src/ ./src
-COPY pyproject.toml .
-COPY requirements.txt .
-COPY README.md .
-COPY Makefile .
-RUN apt-get install -y --no-install-recommends g++
-RUN make install
+# avoid HOME/.local/share (hard to predict USER here)
+# so let XDG_DATA_HOME coincide with fixed system location
+# (can still be overridden by derived stages)
+ENV XDG_DATA_HOME /usr/local/share
+# avoid the need for an extra volume for persistent resource user db
+# (i.e. XDG_CONFIG_HOME/ocrd/resources.yml)
+ENV XDG_CONFIG_HOME /usr/local/share/ocrd-resources
+
+WORKDIR /build/eynollah
+COPY . .
+COPY ocrd-tool.json .
+# prepackage ocrd-tool.json as ocrd-all-tool.json
+RUN ocrd ocrd-tool ocrd-tool.json dump-tools > $(dirname $(ocrd bashlib filename))/ocrd-all-tool.json
+# install everything and reduce image size
+RUN apt-get install -y --no-install-recommends g++ && make install && rm -rf /build/eynollah && apt-get remove -y --auto-remove g++
 
 WORKDIR /data
 VOLUME /data