Install a font

[fmaussion]

It's not a big deal, but I didn't manage to install a font properly.

I am running this postbuild:

oggm-edu/postBuild

Lines 5 to 8 in 0e5729f

	mkdir ~/.fonts
	wget http://antiyawn.com/uploads/Humor-Sans-1.0.ttf
	mv Humor-Sans-1.0.ttf ~/.fonts/Humor-Sans-1.0.ttf
	fc-cache -fv -y ~/.fonts

But the build errors with:

Fontconfig error: Cannot load default config file

@TimoRoth if ever you happen to know what to do I'd be interested - not very important though.

[fmaussion]

To debug the Docker builds we could do this locally: https://github.com/jupyter/repo2docker

(but it's really not the most important issue ;-)

[nchampollion]

I know it was just to warm up a little bit ! However, it's solved in my laptop ... maybe someone else should test it.

[fmaussion]

Yes, locally it works - the issue is about installing a font on a docker container so that binder can use it.

To be honest I think only @TimoRoth can solve this ;-)

[nchampollion]

I see ! Indeed, we need rescue from @TimoRoth :-)

[fmaussion]

This now works nicely ;-)