Remove alpine testing repository from docker image

The freeimage library is available in community since some time now.
daoo · Oct 2, 2022 · a632b84 · a632b84
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diff --git a/Dockerfile b/Dockerfile
@@ -1,7 +1,5 @@
 FROM alpine:edge
 
-# As of 2018-11-11 freeimage was only available in testing
-RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories
 RUN apk --no-cache add pkgconfig meson ninja gcc g++ clang glew-dev glm-dev freeimage-dev glfw-dev libxcursor-dev
 
 COPY . /pathtracer

diff --git a/readme.md b/readme.md
@@ -16,7 +16,7 @@ Uses meson and ninja for building:
     ninja -C builddir
 
 The [Dockerfile](https://github.com/daoo/pathtracer/blob/master/Dockerfile)
-describes the build environment that is used with travis.
+describes the build environment that is used with github workflows.
 
 ## Running