Adding updated dockerfile

Dockerfile

@@ -0,0 +1,42 @@
+#Dockerfile to build a pdf2htmlEx image
+
+FROM ubuntu
+
+#
+#Install git and all dependencies
+#
+RUN apt update \
+	&& apt -y install -qq git cmake autotools-dev libopenjp2-7-dev libtiff5-dev libpng-dev libgif-dev libxt-dev autoconf automake libtool bzip2 libxml2-dev libuninameslist-dev libspiro-dev python-dev libpango1.0-dev libcairo-dev chrpath uuid-dev uthash-dev software-properties-common libpoppler-private-dev libpoppler-glib-dev wget
+
+RUN add-apt-repository ppa:fontforge/fontforge \
+	&& apt update \
+	&& apt install -y fontforge libfontforge-dev 
+
+RUN wget https://poppler.freedesktop.org/poppler-0.81.0.tar.xz \
+	&& tar xvf poppler-0.81.0.tar.xz \
+	&& cd poppler-0.81.0 \
+	&& mkdir build \
+	&& cd build \
+	&& cmake \
+		-DCMAKE_BUILD_TYPE=Release \
+		-DCMAKE_INSTALL_PREFIX=/usr \ 
+		-DTESTDATADIR=$PWD/testfiles \ 
+		-DENABLE_UNSTABLE_API_ABI_HEADERS=ON \
+		.. \
+	&& make \
+	&& make install \
+	&& cd ../..
+
+#
+#Clone and install the pdf2htmlEX git repo
+#
+RUN git clone git://github.com/pdf2htmlEX/pdf2htmlEX.git \
+	&& cd pdf2htmlEX \
+	&& cmake . \
+	&& make \
+	&& make install
+
+VOLUME /pdf
+WORKDIR /pdf
+
+CMD ["pdf2htmlEX"]