🐛 Use my version of ocrd_models until fix is merged

Dockerfile

@@ -15,7 +15,8 @@ RUN apt-get update && \
     apt-get clean
 
 COPY requirements.txt /tmp
-RUN pip3 install --no-cache-dir -r /tmp/requirements.txt
+RUN pip3 install --no-cache-dir ocrd-utils && \
+    pip3 install --no-cache-dir -r /tmp/requirements.txt
 
 COPY my_ocrd_workflow /usr/bin
 COPY xsd              /usr/bin/xsd

requirements.txt

@@ -1,4 +1,8 @@
+# XXX use official release when https://github.com/OCR-D/core/pull/250 is merged:
+git+https://github.com/mikegerber/core.git@f385c5fc428fd27a48910ddf047241df19c6b378#subdirectory=ocrd_models&egg=ocrd-models
+
 git+https://github.com/seuretm/ocrd_typegroups_classifier.git
+
 ocrd_kraken
 tesserocr == 2.3.1  # 2.4.0 fails with Ubuntu 18.04's tesseract
 ocrd_tesserocr