Update cheatsheets

dokku

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# dokku
+
+> Docker powered mini-Heroku (PaaS).
+> Easily deploy multiple apps to your server in different languages using a single `git-push` command.
+> More information: <https://github.com/dokku/dokku>.
+
+- List running apps:
+
+`dokku apps`
+
+- Create an app:
+
+`dokku apps:create {{app_name}}`
+
+- Remove an app:
+
+`dokku apps:destroy {{app_name}}`
+
+- Install plugin:
+
+`dokku plugin:install {{full_repo_url}}`
+
+- Link database to an app:
+
+`dokku {{db}}:link {{db_name}} {{app_name}}`