feat: update Dockerfile on ImageMagick (#3)

lmarti · web-flow · commit a3c9d4d73731 · 2020-11-21T00:00:40.000+08:00
Installing ImageMagick to support image manipulation. Required by [jekyll_picture_tag](https://github.com/rbuchberger/jekyll_picture_tag).
diff --git a/Dockerfile b/Dockerfile
@@ -9,6 +9,9 @@ RUN apk add --no-cache git build-base
 # Allow for timezone setting in _config.yml
 RUN apk add --update tzdata
 
+# Installing imagemagick and RMagick - required for jekyll_picture_tag
+RUN apk add --update pkgconfig imagemagick imagemagick-dev imagemagick-libs
+
 # debug
 RUN bundle version
 
