Release 0.17.4

# History

## 0.17.4

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.17.4/bootstrap.sh
sudo DOKKU_TAG=v0.17.4 bash bootstrap.sh
```

### New Features

- #3575: @josegonzalez Add a way to cleanup apps for specific schedulers

docs/assets/versions.json

@@ -14,6 +14,6 @@
     "0.14.6",
     "0.15.5",
     "0.16.4",
-    "0.17.3"
+    "0.17.4"
   ]
 }