Configure Gitpod (#625)

* Declare ruby version for rbenv

* Add gitpod start

* Use the Dockerfile

* Integrate bundler version

* Use gitpod recs

* Declare port

* Install bundler upon init

* Add more customization

* Fix typo

* Rename Dockerfile

.gitpod.Dockerfile

@@ -0,0 +1,8 @@
+FROM gitpod/workspace-postgres
+USER gitpod
+
+# Install the Ruby version specified in '.ruby-version'
+COPY --chown=gitpod:gitpod .ruby-version /tmp
+RUN echo "rvm_gems_path=/home/gitpod/.rvm" > ~/.rvmrc
+RUN bash -lc "rvm install ruby-$(cat /tmp/.ruby-version) && rvm use ruby-$(cat /tmp/.ruby-version) --default"
+RUN echo "rvm_gems_path=/workspace/.rvm" > ~/.rvmrc

.gitpod.yml

@@ -0,0 +1,11 @@
+image:
+  file: .gitpod.Dockerfile
+
+tasks:
+  - init: gem install bundler:2.2.9 && bundle install
+    command: bundle exec jekyll serve --livereload
+    openMode: split-right
+
+ports:
+  - port: 4000
+    onOpen: open-browser