Add dockerfile, create development deps group

Dockerfile

@@ -0,0 +1,32 @@
+# ------- Build -------
+FROM ruby:2.7.1-alpine3.11 AS build
+
+RUN apk add build-base
+
+RUN mkdir -p /app
+WORKDIR /app
+
+COPY Gemfile .
+COPY Gemfile.lock .
+RUN bundle config set deployment 'true'
+RUN bundle config set without 'development'
+RUN bundle install
+
+COPY content content/
+COPY layouts layouts/
+COPY lib lib/
+COPY Guardfile .
+COPY Rules .
+COPY nanoc.yaml .
+
+RUN bundle exec nanoc
+
+
+
+# ------- Release -------
+FROM nginx:latest AS release
+
+RUN rm -rf /usr/share/nginx/html/*
+COPY --from=build /app/output /usr/share/nginx/html
+
+ENTRYPOINT ["nginx", "-g", "daemon off;"]

Gemfile

@@ -3,7 +3,6 @@ source 'https://rubygems.org'
 
 gem 'adsf'
 gem 'autoprefixer-rails'
-gem 'byebug'
 gem 'htmlcompressor'
 gem 'kramdown'
 gem 'mini_racer'
@@ -18,3 +17,7 @@ group :nanoc do
   gem 'guard-nanoc'
   gem 'guard-livereload'
 end
+
+group :development do
+  gem 'byebug'
+end