sudo is required to build tails but it is not documented

I followed instructions on http://tails.boum.org/contribute/build and got asked for a sudo password. Please either document that sudo access is needed or remove the need for it.

Related issues

Blocks #13244 (closed)

Original created by @alant on 15055 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information