More and better variables, and general clean-up

Dockerfile

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+FROM ubuntu:18.04
+RUN apt-get update && apt-get upgrade -y && apt-get install wget gnupg expect -y && \
+    wget -O - https://packages.icinga.com/icinga.key | apt-key add -
+RUN printf "deb http://packages.icinga.com/ubuntu icinga-bionic main\ndeb-src http://packages.icinga.com/ubuntu icinga-bionic main" > /etc/apt/sources.list.d/icinga2.list && \
+    apt-get update && apt-get install icinga2 -y && \
+    mkdir /run/icinga2 && chown nagios:nagios /run/icinga2 && \
+    mkdir -p /var/lib/icinga2/certs && \
+    chown -R nagios:nagios /var/lib/icinga2/certs
+
+COPY create-satellite.sh /create-satellite.sh
+COPY run-icinga.sh /run-icinga.sh
+RUN chmod +x /create-satellite.sh ; chmod +x /run-icinga.sh
+
+ENTRYPOINT ["/run-icinga.sh"]