r/minio: Start more reliably on boot

The MinIO service often fails to start from a cold boot.  Delaying
starting the service until the network is online, plus increasing the
startup timeout, should help with this.  If not, enabling auto restart
will let systemd try to start the service again if it still fails to
come up on time.

roles/minio/templates/minio.container.j2

@@ -1,7 +1,7 @@
 [Unit]
 Description=MinIO Object Storage
-Wants=network.target
-After=network.target
+Wants=network-online.target
+After=network-online.target
 
 [Container]
 Image={{ minio_container_image }}:{{ minio_version }}
@@ -16,6 +16,8 @@ NoNewPrivileges=yes
 
 [Service]
 ExecReload=/bin/kill -HUP $MAINPID
+TimeoutStartSec=5min
+Restart=always
 MemoryDenyWriteExecute=yes
 PrivateTmp=yes
 ProtectClock=yes