Add missing packages.

Dockerfile

@@ -8,11 +8,11 @@ RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
 
 RUN apt-get update && \
     apt-get upgrade -y && \
-    apt-get install -y build-essential gdal-bin libavcodec-dev \
+    apt-get install -y build-essential cmake gdal-bin libavcodec-dev \
         libavdevice-dev libavfilter-dev libavformat-dev libavresample-dev \
         libavutil-dev libboost-python-dev libjpeg-dev libleptonica-dev \
         libsqlite3-mod-spatialite libswscale-dev libtesseract-dev nodejs \
-        python3 python3-dev python3-pip python3-venv tesseract-ocr \
+        pkg-config python3 python3-dev python3-pip python3-venv tesseract-ocr \
         tesseract-ocr-all && \
     npm install -g yarn