Add example to run php-fpm, scheduler and queue worker in the same container with supervisor

v5/supervisor/Dockerfile

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+FROM invoiceninja/invoiceninja:5
+
+USER root
+
+RUN apk add --no-cache supervisor \
+  && mkdir /var/log/supervisord /var/run/supervisord \
+  && chown $INVOICENINJA_USER:www-data /var/log/supervisord /var/run/supervisord
+
+COPY supervisord.conf /
+
+USER $INVOICENINJA_USER
+
+CMD ["/usr/bin/supervisord", "-c", "/supervisord.conf"]

v5/supervisor/supervisord.conf

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+[supervisord]
+nodaemon=true
+user=invoiceninja
+logfile=/var/log/supervisord/supervisord.log
+pidfile=/var/run/supervisord/supervisord.pid
+childlogdir=/var/log/supervisord/
+logfile_maxbytes=50MB                           ; maximum size of logfile before rotation
+logfile_backups=10                              ; number of backed up logfiles
+loglevel=error
+
+[program:php-fpm]
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+command=php-fpm
+
+[program:scheduler]
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+command=php artisan schedule:work
+
+[program:queue-worker]
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+command=php artisan queue:listen