From 920d82f073fa4b19d8a536600b0557e41c409de3 Mon Sep 17 00:00:00 2001
From: Christian Nicolai <christian.nicolai@camunda.com>
Date: Thu, 18 Feb 2021 11:25:05 +0100
Subject: [PATCH] docker: allow successful compiling of nio4r gem dependency

- now seems to need linux-headers, see https://github.com/socketry/nio4r/issues/225
---
 docker/Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docker/Dockerfile b/docker/Dockerfile
index 0fe89a7..9098e3b 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -6,7 +6,7 @@ ARG DYNDNSD_VERSION=3.3.0
 
 RUN apk --no-cache add openssl ca-certificates && \
     apk --no-cache add ruby ruby-etc ruby-io-console ruby-json ruby-webrick && \
-    apk --no-cache add --virtual .build-deps ruby-dev build-base tzdata && \
+    apk --no-cache add --virtual .build-deps linux-headers ruby-dev build-base tzdata && \
     gem install --no-document dyndnsd -v ${DYNDNSD_VERSION} && \
     # set timezone to Berlin
     cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime && \