Unable to run appimagetool on a docker arm environment

Hello

I am trying to run the ci version of the appimagetool for arm32v7 and arm32v8 on docker, using the official debian:stable and centos images.

Specifically I've tried to run, with no luck :
* `appimagetool-aarch64.AppImage` on `arm64v8/centos` and `arm64v8/debian:stable`
* `appimagetool-armhf.AppImage` on `arm32v7/centos` and `arm32v7/debian:stable`

The exact command I am trying to run is `appimagetoo.*.AppImage --appimage-extract`

The error I get is this:
```
bash: ./appimagetool-armhf.AppImage: cannot execute binary file: Exec format error
```
or
```
bash: ./appimagetool-aarch64.AppImage: cannot execute binary file: Exec format error
```
I have also checked the downloaded file with the `file` command and I got this message
```
appimagetool-aarch64.AppImage: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for GNU/Linux 3.7.0, BuildID[sha1]=b0fb5c0d824dce460722a3c8da347f6053115800, stripped
```

I have checked these docker files with other applications and my own (nim) projects and they work just fine. So where is the problem?