Orange pi emmc support + use directly yunohost image

[zamentur]

Goal

This PR do 3 things (i know it's bad...):

• Add an option -m to install the internetcube on an emmc device
• Support orangepi pc plus (we use this board for ARN NeutriBox)
• Download a yunohost image and convert it automatically into internetcube image. With this fix, the tutorial describes on install.labriqueinter.net will work. Currently, without this fix, it's quite difficult to install an internet cube for a non yunohost/intercube contributor

Status

I am currently rereading this PR, that's why i create the PR, to read it without my terminal.

How to test

Don't test for now it's not finished

[keomabrun]

Yopyop ! @zamentur is it now ready to test ?

The install-sd script should currently work out of the box for a non yunohost/intercube contributor. What went wrong for you ?
It downloads the latest image from https://repo.labriqueinter.net/. The image name should be internetcube-<distrib>-latest-<arch>.img.tar.xz

Building the image is currently done using : https://github.com/labriqueinternet/build.labriqueinter.net and it seems that your current script does some conversion too.
If you think we should use the same script for building and flashing, lets talk about it and maybe merge the two scripts :)

[zamentur]

If you think we should use the same script for building and flashing, lets talk about it and maybe merge the two scripts :)

This PR is a merge of the build script and the install-sd.sh

I think we need that beacause it's difficult to maintain up to date images, and the image creation is very quick.

[zamentur]

Yopyop ! @zamentur is it now ready to test ?

I still have an orange pi to install (for friday) i will check if the script is ok. I think there is small issues with emmc part.

[keomabrun]

@zamentur , were you able to perform the tests you mentioned ?

[keomabrun]

@zamentur, can you move that PR to the image-building repo ? https://github.com/YunoHost/arm-images