Release 0.23.7

# History

## 0.23.7

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.23.7/bootstrap.sh
sudo DOKKU_TAG=v0.23.7 bash bootstrap.sh
```

### Bug Fixes

- #4421: @josegonzalez Keep the git directory for worktree-enabled installations

### New Features

- #4420: @josegonzalez Add ability to specify X-Forwarded-Ssl header for proxied requests

### Documentation

- #4422: @josegonzalez Add warning regarding shallow clone pushes
- #4417: @andrewk17 Correct vector sink example command
- #4414: @josegonzalez Use correct html for offsite digitalocean link
- #4413: @josegonzalez Fix SSL documentation link in troubleshooting docs

### Other

- #4423: @josegonzalez Drop unused sigil packaging code
- #4418: @josegonzalez Drop unused skip-restart flag for proxy:disable

docs/development/release-process.md

@@ -29,7 +29,7 @@ The workflow looks like this:
 ```shell
 # having dokku-arch in ../dokku-arch
 vagrant up build-arch
-# wait for "==> build-arch: ==> Finished making: dokku 0.23.6-2 (Mon Feb 22 23:20:37 CET 2016)"
+# wait for "==> build-arch: ==> Finished making: dokku 0.23.7-2 (Mon Feb 22 23:20:37 CET 2016)"
 cd ../dokku-arch
 git add PKGBUILD .SRCINFO
 git commit -m 'Update to dokku 0.9.9'