Copy the Docker-based setup from docs.scala-lang

That should fix the problems people report when they try to build the website.

Author: julienrf

Dockerfile

@@ -1,10 +1,12 @@
-FROM ruby:2.6
+FROM ruby:2.6.9
 
-RUN gem install bundler jekyll
+RUN gem install rouge -v3.30.0
+RUN gem install bundler:2.3.10 jekyll
 
 WORKDIR /srv/jekyll
 
 COPY Gemfile .
 COPY Gemfile.lock .
 
+RUN chmod u+s /bin/chown
 RUN bundle install

README.md

@@ -18,16 +18,16 @@ Markdown.
 ## Building the site
 Make sure you are in the root directory of the cloned repository.
 ### With `docker-compose`:
-```
-docker-compose up
-```
 
-When the website dependencies change (the content of the `Gemfile`),
-you have to re-build the Docker image:
+To build and view site with Docker:
 
-```
-docker-compose up --build
-```
+    env UID="$(id -u)" GID="$(id -g)" docker-compose up
+
+It will incrementally build and serve site at `http://localhost:4000`.
+
+In case the Dockerfile changed, re-build it with:
+
+    env UID="$(id -u)" GID="$(id -g)" docker-compose up --build
 
 ### With Bundler:
 

docker-compose.yml

@@ -1,9 +1,11 @@
-version: "2"
+version: '2'
+
 services:
-  scala-lang:
+  jekyll:
+    user: "${UID}:${GID}"
     build: .
-    command: bundle exec jekyll serve --incremental --host=0.0.0.0
+    command: sh -c "chown $UID / && bundle exec jekyll serve --incremental --host=0.0.0.0 "
     ports:
-      - 4000:4000
+      - '4000:4000'
     volumes:
       - .:/srv/jekyll