Charging station with Mender

We will use Mender as OTA service for updating Linux, Docker and the client.

Sign up on Mender. If you want, host a Mender server yourself.
Follow this guide for installing Mender on the Pi.
Add the Raspberry to the Devices list and test if Mender works.

If you do not wish to automatically update the OCPP client, change this label to false in docker-compose.yaml:

   #Not recommended when using Mender, since you can update the images with Mender.
   chargepi:
     label:
       - com.centurylinklabs.watchtower.enable="false"
       #...

Run docker-compose:
```
docker-compose up -d
```
Optionally, you can run only the client service:
```
docker-compose up -d chargepi
```