`cabal v2-build` doesn't respect `builddir` option in `~/.cabal/config`

**To Reproduce**
Steps to reproduce the behavior:

Add `builddir: dist` to `~/.cabal/config`.
```
$ cabal init
$ cabal v2-build
```
The build artifacts still go to `dist-newstyle`.

**Expected behavior**
The build artifacts go to `dist` (this is the case with `cabal v1-build`).

**System information**
cabal-install version 3.6.2.0