Merge branch 'add-MIX_ENV-to-systemd-example' into 'develop'

Add MIX_ENV=prod to systemd example file

See merge request pleroma/pleroma!445

installation/pleroma.service

@@ -6,6 +6,7 @@ After=network.target postgresql.service
 User=pleroma
 WorkingDirectory=/home/pleroma/pleroma
 Environment="HOME=/home/pleroma"
+Environment="MIX_ENV=prod"
 ExecStart=/usr/local/bin/mix phx.server
 ExecReload=/bin/kill $MAINPID
 KillMode=process