Improve Docker deployment

Reduce the image size to 1Gb,
 mount `_site` for better caching,
 reduce the number of docker image layers

Author: vlad20012

.dockerignore

@@ -1,4 +1,9 @@
-_posts/
-assets/
-_docs/
-_includes/
+/.git/
+/_site/
+/_posts/
+/assets/
+/_docs/
+/_includes/
+/.idea/
+/*.iml
+/README.md

.run/intellij-rust.github.io.run.xml

@@ -36,6 +36,10 @@
               <option name="hostPath" value="$PROJECT_DIR$/_includes/" />
               <option name="readOnly" value="true" />
             </DockerVolumeBindingImpl>
+            <DockerVolumeBindingImpl>
+              <option name="containerPath" value="/intellij-rust.github.io/_site" />
+              <option name="hostPath" value="$PROJECT_DIR$/_site/" />
+            </DockerVolumeBindingImpl>
           </list>
         </option>
       </settings>

Dockerfile

@@ -5,10 +5,7 @@ RUN apt-get update && apt-get install -y build-essential
 COPY . /intellij-rust.github.io
 WORKDIR /intellij-rust.github.io
 
-RUN gem install github-pages jekyll jekyll-feed
-RUN bundle add webrick
-RUN bundle update
-RUN bundle install
+RUN gem install github-pages jekyll jekyll-feed && bundle add webrick && bundle update && bundle install
 
 EXPOSE 8080
 

README.md

@@ -42,5 +42,6 @@ $ docker run \
   -v $PWD/assets:/intellij-rust.github.io/assets \
   -v $PWD/_docs:/intellij-rust.github.io/_docs \
   -v $PWD/_includes:/intellij-rust.github.io/_includes \
+  -v $PWD/_site:/intellij-rust.github.io/_site \
   -p 8080:8080 -it intellij-rust.github.io
 ```

_config.yml

@@ -9,6 +9,7 @@
 title: IntelliJ Rust
 email: ""
 description: Open-source Rust plugin for IntelliJ-based IDEs
+repository: intellij-rust/intellij-rust.github.io
 
 collections:
   docs: