Docker Container: Init 1 & Initialisation

- Now using a setup script before starting the app. The separation of
the run script and the setup script will make service initialisation a
little bit clearer
- Now calling start.sh script as ENTRYPOINT and S6 as CMD. This way
when running the container with just a shell script, the start.sh
script will be launched before, making debugging easier
- Added note about `.dockerignore` ignored during Docker Hub Automated
Build

.dockerignore

@@ -1,7 +1,15 @@
 .git
+.git/
+.git/*
 conf
+conf/
+conf/*
 packager
+packager/
+packager/*
 scripts
+scripts/
+scripts/*
 *.yml
 *.md
 .bra.toml