Ubuntu 20.04: Add pkg-config and libquazip

This allows testing dynamic linking as well in this container.

Author: dbrgn

ubuntu-20.04/Dockerfile

@@ -20,8 +20,11 @@ RUN apt-get update -q && apt-get -y -q install --no-install-recommends \
     libqt5opengl5-dev \
     libqt5svg5-dev \
     libqt5sql5-sqlite \
+    libquazip5-1 \
+    libquazip5-dev \
     make \
     openssl \
+    pkg-config \
     python3 \
     python3-pip \
     python3-setuptools \