Add support for building ubuntu:20.04-based docker images + some automation

dockerfiles/zeronet-Dockerfile

@@ -0,0 +1,36 @@
+# Base settings
+ENV HOME /root
+
+# Install packages
+
+COPY install-dep-packages.sh /root/install-dep-packages.sh
+
+RUN /root/install-dep-packages.sh install
+
+COPY requirements.txt /root/requirements.txt
+
+RUN pip3 install -r /root/requirements.txt \
+ && /root/install-dep-packages.sh remove-makedeps \
+ && echo "ControlPort 9051" >> /etc/tor/torrc \
+ && echo "CookieAuthentication 1" >> /etc/tor/torrc
+
+RUN python3 -V \
+ && python3 -m pip list \
+ && tor --version \
+ && openssl version
+
+# Add Zeronet source
+
+COPY . /root
+VOLUME /root/data
+
+# Control if Tor proxy is started
+ENV ENABLE_TOR false
+
+WORKDIR /root
+
+# Set upstart command
+CMD (! ${ENABLE_TOR} || tor&) && python3 zeronet.py --ui_ip 0.0.0.0 --fileserver_port 26552
+
+# Expose ports
+EXPOSE 43110 26552