Release 0.21.4

# History

## 0.21.4

Install/update via the bootstrap script:

```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.21.4/bootstrap.sh
sudo DOKKU_TAG=v0.21.4 bash bootstrap.sh
```

### Bug Fixes

- #4092: @Yihao-G Fix nginx proxy-read-timeout not set for HTTPS
- #4095: @GennadySpb Fix application removal during uninstallation

### New Features

- #4097: @josegonzalez Update herokuish

### Documentation

- #4096: @josegonzalez Clarify that special config variables are not exposed to applications
- #4007: @turicas Clarify nginx.conf.sigil path in image when deploying non-buildpack apps
- #4078: @gurpreetatwal Add more details to `nginx-dokku-template-source` trigger
- #4090: @ankane Official plugins no longer in beta
- #4085: @josegonzalez Set warning on resource type as an actual warning

### Other

- #4082: @dependabot-preview[bot] chore(deps): bump monolog/monolog from 1.25.4 to 1.25.5 in /tests/apps/php

docs/getting-started/install/docker.md

@@ -3,7 +3,7 @@
 Pull the dokku/dokku image:
 
 ```shell
-docker pull dokku/dokku:0.21.3
+docker pull dokku/dokku:0.21.4
 ```
 
 Next, run the image.
@@ -17,7 +17,7 @@ docker run \
   --publish 8443:443 \
   --volume /var/lib/dokku:/mnt/dokku \
   --volume /var/run/docker.sock:/var/run/docker.sock \
-  dokku/dokku:0.21.3
+  dokku/dokku:0.21.4
 ```
 
 Dokku is run in the following configuration:

docs/getting-started/installation.md

@@ -21,8 +21,8 @@ To install the latest stable version of Dokku, you can run the following shell c
 
 ```shell
 # for debian systems, installs Dokku via apt-get
-wget https://raw.githubusercontent.com/dokku/dokku/v0.21.3/bootstrap.sh;
-sudo DOKKU_TAG=v0.21.3 bash bootstrap.sh
+wget https://raw.githubusercontent.com/dokku/dokku/v0.21.4/bootstrap.sh;
+sudo DOKKU_TAG=v0.21.4 bash bootstrap.sh
 ```
 
 The installation process takes about 5-10 minutes, depending upon internet connection speed.