Sentry logging exceptions and some trace logging

distribution/docker-build/Dockerfile

@@ -1,16 +1,25 @@
-FROM ubuntu:xenial AS builder
+FROM ubuntu:focal AS builder
 
 ENV DEBIAN_FRONTEND noninteractive 
 ENV MONO_VERSION 5.18
 
+RUN apt-get update && \
+    apt-get -y -o Dpkg::Options::="--force-confold" install --no-install-recommends \
+        apt-transport-https \
+        wget dirmngr gpg gpg-agent \
+        # add-apt-repository for PPAs
+        software-properties-common && \
+    rm -rf /var/lib/apt/lists/*
+	
 RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF && \
-    echo "deb http://download.mono-project.com/repo/debian stable-xenial/snapshots/$MONO_VERSION main" > /etc/apt/sources.list.d/mono-official-stable.list && \
+    echo "deb http://download.mono-project.com/repo/debian stable-focal main" > /etc/apt/sources.list.d/mono-official-stable.list && \
     apt-get update && apt-get install -y \ 
         devscripts build-essential tofrodos \
         dh-make dh-systemd \
         cli-common-dev \
         mono-complete \
-        sqlite3 libcurl3 mediainfo
+        sqlite3 libcurl4 mediainfo
+RUN apt-get upgrade -y
 
 RUN apt-cache policy mono-complete
 RUN apt-cache policy cli-common-dev