Decide mid-term strategy regarding easy, self-contained build environment

Once we have evaluated potential solutions, we need to make a decision. Ideally, at a time when we can ensure that this solution works on Debian Jessie.

Parent Task: #7526 (closed)

Related issues

Related to #15349
Blocked by #7528 (closed)
Blocked by #7529 (closed)

Original created by @intrigeri on 7580 (Redmine)

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