From f7069df97282f04a49df102674a38a5913c675c1 Mon Sep 17 00:00:00 2001
From: Joseph Gardner <josephgardner@users.noreply.github.com>
Date: Fri, 1 Dec 2023 18:46:16 -0500
Subject: [PATCH] Fix failing docs build (#1186)

The [readthedocs build](https://readthedocs.org/projects/helmfile/builds/) is failing due to a missing required `build.os`

```
Error
Problem in your project's configuration. Invalid configuration option "build.os": build not found
```

Signed-off-by: Joseph Gardner <josephgardner@users.noreply.github.com>
---
 .readthedocs.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 5c76c8b0..fbe95070 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -4,6 +4,9 @@ mkdocs:
   configuration: mkdocs.yml
   fail_on_warning: false
 
+build:
+  os: ubuntu-22.04
+
 python:
    install:
    - requirements: docs/requirements.txt