Install assets during the build process.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | ---
| Fixed tickets | #1471
| Refs tickets  | ---
| License       | MIT
| Doc PR        | ---

I'm not entirely sure this is right @drak, of course I could not test it.