Use supervisor and fixup env generation

supervisor/sidekiq.conf

@@ -0,0 +1,12 @@
+[program:sidekiq]
+priority=10
+directory=/app/code
+environment=HOME=/app/code,DB_POOL=25,RAILS_ENV=production,MALLOC_ARENA_MAX=2
+command=bundle exec sidekiq -c 2 -e production
+user=cloudron
+autostart=true
+autorestart=true
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0