Update Dockerfile

Dockerfile

@@ -1,14 +1,15 @@
 FROM ubuntu:20.04
 
 ENV DEBIAN_FRONTEND=noninteractive
-
-# Install dependencies
-RUN apt-get update && apt-get install -y \
+RUN ln -fs /usr/share/zoneinfo/Etc/UTC /etc/localtime && \
+    apt-get update && \
+    apt-get install -y \
     wget build-essential cmake git g++ pkg-config libfontforge-dev \
     fontforge libpoppler-glib-dev poppler-utils \
     libpng-dev libjpeg-dev libtiff-dev \
     zlib1g-dev libfreetype6-dev libxrender-dev \
-    libxml2-dev libspiro-dev python3 python3-pip && \
+    libxml2-dev libspiro-dev libpango1.0-dev \
+    tzdata python3 python3-pip && \
     apt-get clean
 
 # Clone and build pdf2htmlEX