Release 0.23.8

# History

## 0.23.8

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.23.8/bootstrap.sh
sudo DOKKU_TAG=v0.23.8 bash bootstrap.sh
```

### Bug Fixes

- #4437: @josegonzalez Switch to using GIT_DIR environment variable to fix Centos 7 support
- #4436: @josegonzalez Properly handle directory change when cleaning .git directory

### New Features

- #4428: @josegonzalez Bump azure ARM quickstart template on release

### Documentation

- #4435: @josegonzalez Change page title based on current page
- #4427: @josegonzalez Change process management doc references to make more sense

### Other

- #4438: @josegonzalez Split out nginx tests further to decrease overall CI runtime
- #4430: @dependabot-preview[bot] chore(deps): bump jetty-servlet from 11.0.0 to 11.0.1 in /tests/apps/java

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 0.23.7-2 (Mon Feb 22 23:20:37 CET 2016)"
+# wait for "==> build-arch: ==> Finished making: dokku 0.23.8-2 (Mon Feb 22 23:20:37 CET 2016)"
 cd ../dokku-arch
 git add PKGBUILD .SRCINFO
 git commit -m 'Update to dokku 0.9.9'