debian 9.8 -- tesseract 4

docker/Dockerfile

@@ -4,7 +4,7 @@
 # BASE_IMAGE - Bare bones image with the base packages needed to run Mayan EDMS
 ####
 
-FROM debian:10-slim as BASE_IMAGE
+FROM debian:9.8-slim as BASE_IMAGE
 
 LABEL maintainer="Roberto Rosario roberto.rosario@mayan-edms.com"
 
@@ -31,7 +31,7 @@ apt-get update \
     graphviz \
     libfuse2 \
     libmagic1 \
-    libmariadbclient-dev \
+    libmariadbclient18 \
     libreoffice \
     libpq5 \
     poppler-utils \
@@ -40,7 +40,6 @@ apt-get update \
     sudo \
     supervisor \
 		git \
-    tesseract-ocr \
 # Remove make and build dependencies
 && apt-get remove make libproxy-tools libreoffice-avmedia-backend-vlc libvlc-bin libvlc5 libvlccore9 adwaita-icon-theme gsettings-desktop-schemas libgstreamer-plugins-base1.0-0 -y \
 && apt-get autoremove -y --purge \
@@ -63,6 +62,10 @@ echo "save \"\"" >> /etc/redis/redis.conf \
 # Only provision 1 database
 && echo "databases 1" >> /etc/redis/redis.conf
 
+RUN printf "deb http://httpredir.debian.org/debian stretch-backports main non-free\ndeb-src http://httpredir.debian.org/debian stretch-backports main non-free" > /etc/apt/sources.list.d/backports.list \
+			&& apt-get update \
+			&& apt-get install -t stretch-backports -y tesseract-ocr tesseract-ocr-deu
+
 ####
 # BUILDER_IMAGE - This image buildS the Python package and is discarded afterwards
 ####
@@ -109,7 +112,7 @@ RUN python -m virtualenv "${PROJECT_INSTALL_DIR}" \
 && . "${PROJECT_INSTALL_DIR}/bin/activate" \
 && pip install --no-cache-dir --no-use-pep517 \
     librabbitmq==1.6.1 \
-    git+https://github.com/PyMySQL/mysqlclient-python.git \
+    mysql-python==1.2.5 \
     psycopg2==2.7.3.2 \
     redis==2.10.6 \
 # psutil is needed by ARM builds otherwise gevent and gunicorn fail to start