Port to OCR-D/core API v3

Dockerfile

@@ -6,17 +6,30 @@ LABEL \
     maintainer="https://github.com/qurator-spk/dinglehopper/issues" \
     org.label-schema.vcs-ref=$VCS_REF \
     org.label-schema.vcs-url="https://github.com/qurator-spk/dinglehopper" \
-    org.label-schema.build-date=$BUILD_DATE
+    org.label-schema.build-date=$BUILD_DATE \
+    org.opencontainers.image.vendor="DFG-Funded Initiative for Optical Character Recognition Development" \
+    org.opencontainers.image.title="dinglehopper" \
+    org.opencontainers.image.description="The OCR evaluation tool" \
+    org.opencontainers.image.source="https://github.com/qurator-spk/dinglehopper" \
+    org.opencontainers.image.documentation="https://github.com/qurator-spk/dinglehopper/blob/${VCS_REF}/README.md" \
+    org.opencontainers.image.revision=$VCS_REF \
+    org.opencontainers.image.created=$BUILD_DATE \
+    org.opencontainers.image.base.name=ocrd/core
+
+ENV LANG=C.UTF-8
+ENV LC_ALL=C.UTF-8
+
+# 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/dinglehopper
-COPY pyproject.toml .
-COPY src/dinglehopper/ocrd-tool.json .
-COPY src ./src
-COPY requirements.txt .
-COPY README.md .
-COPY Makefile .
-RUN make install
-RUN rm -rf /build/dinglehopper
+COPY . .
+RUN make install && rm -rf /build/dinglehopper
 
 WORKDIR /data
-VOLUME ["/data"]
+VOLUME /data