docker-compose setup + mysql doesn't support articles with emojis

i am using the [wallabag docker-compose setup](https://github.com/wallabag/docker#docker-compose). I am receiving a 500: Internal Server Error when I try to bag this page:
https://blog.kentcdodds.com/how-getting-into-open-source-has-been-awesome-for-me-8480cd756a80

I get this error from the browser addon, web application, and android app.

here is the [full error message from web application](https://pastebin.com/raw/impdbw2d) - [error message as picture](https://i.imgur.com/SbS6Zn6.png)

android app error message:
```
Server error
Error: com.di72nn.stuff.wallabag.apiwrapper.exceptions.UnsuccessfulResponseException: HTTP response: 500 Internal Server Error
```

another user maybe had a [similar issue](https://github.com/wallabag/android-app/issues/647) and the [article](http://raspberryjamberlin.de/zero360-part-1-building-the-zero360/) he tried to bag gets me also the [error described above](https://pastebin.com/raw/6HuEf2Ma).

is this maybe [a related issue?](https://github.com/wallabag/docker/issues/57)

[posted about it yesterday](https://github.com/wallabag/android-app/issues/649), but with too little information and probably in the wrong repo

can you help me with this problem?