Add DNS provider for Derak Cloud (#1909)

docs/content/dns/zz_gen_derak.md

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+---
+title: "Derak Cloud"
+date: 2019-03-03T16:39:46+01:00
+draft: false
+slug: derak
+dnsprovider:
+  since:    "v4.12.0"
+  code:     "derak"
+  url:      "https://derak.cloud/"
+---
+
+<!-- THIS DOCUMENTATION IS AUTO-GENERATED. PLEASE DO NOT EDIT. -->
+<!-- providers/dns/derak/derak.toml -->
+<!-- THIS DOCUMENTATION IS AUTO-GENERATED. PLEASE DO NOT EDIT. -->
+
+
+Configuration for [Derak Cloud](https://derak.cloud/).
+
+
+<!--more-->
+
+- Code: `derak`
+- Since: v4.12.0
+
+
+Here is an example bash command using the Derak Cloud provider:
+
+```bash
+DERAK_API_KEY="xxxxxxxxxxxxxxxxxxxxx" \
+lego --email myemail@example.com --dns derak --domains my.example.org run
+```
+
+
+
+
+## Credentials
+
+| Environment Variable Name | Description |
+|-----------------------|-------------|
+| `DERAK_API_KEY` | The API key |
+
+The environment variable names can be suffixed by `_FILE` to reference a file instead of a value.
+More information [here]({{< ref "dns#configuration-and-credentials" >}}).
+
+
+## Additional Configuration
+
+| Environment Variable Name | Description |
+|--------------------------------|-------------|
+| `DERAK_HTTP_TIMEOUT` | API request timeout |
+| `DERAK_POLLING_INTERVAL` | Time between DNS propagation check |
+| `DERAK_PROPAGATION_TIMEOUT` | Maximum waiting time for DNS propagation |
+| `DERAK_TTL` | The TTL of the TXT record used for the DNS challenge |
+| `DERAK_WEBSITE_ID` | Force the zone/website ID |
+
+The environment variable names can be suffixed by `_FILE` to reference a file instead of a value.
+More information [here]({{< ref "dns#configuration-and-credentials" >}}).
+
+
+
+
+
+<!-- THIS DOCUMENTATION IS AUTO-GENERATED. PLEASE DO NOT EDIT. -->
+<!-- providers/dns/derak/derak.toml -->
+<!-- THIS DOCUMENTATION IS AUTO-GENERATED. PLEASE DO NOT EDIT. -->