Add docker setup

Closes #403

Dockerfile

@@ -0,0 +1,18 @@
+# Start with a Ruby base image
+FROM ruby:2.6
+
+# Install Node.js
+RUN curl -sL https://deb.nodesource.com/setup_12.x | bash -
+RUN apt-get install -y nodejs
+
+# Set working directory
+WORKDIR /app
+
+# Copy project files
+COPY Gemfile Gemfile.lock package.json package-lock.json ./
+
+# Update rubygems
+RUN gem update --system 3.2.3
+
+# Install bundler that works with the current version of Ruby
+RUN gem install bundler:2.4.22 --no-document

Gemfile.lock

@@ -21,10 +21,6 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.8.1)
       public_suffix (>= 2.0.2, < 6.0)
-    async (2.3.1)
-      console (~> 1.10)
-      io-event (~> 1.1)
-      timers (~> 4.1)
     backports (3.17.0)
     better_errors (2.5.1)
       coderay (>= 1.0.0)
@@ -40,8 +36,6 @@ GEM
       execjs
     coffee-script-source (1.12.2)
     concurrent-ruby (1.1.6)
-    console (1.16.2)
-      fiber-local
     contracts (0.16.0)
     crass (1.0.6)
     debug_inspector (0.0.3)
@@ -80,18 +74,18 @@ GEM
     execjs (2.7.0)
     fastimage (2.1.7)
     ffi (1.15.5)
-    fiber-local (1.0.0)
     haml (5.1.2)
       temple (>= 0.8.0)
       tilt
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
     hashie (3.6.0)
     hashugar (1.0.1)
-    html-proofer (5.0.3)
+    html-proofer (4.4.3)
       addressable (~> 2.3)
-      async (~> 2.1)
+      mercenary (~> 0.3)
       nokogiri (~> 1.13)
+      parallel (~> 1.10)
       rainbow (~> 3.0)
       typhoeus (~> 1.3)
       yell (~> 2.0)
@@ -100,7 +94,6 @@ GEM
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
     ice_nine (0.11.2)
-    io-event (1.1.4)
     jbuilder (2.9.1)
       activesupport (>= 4.2.0)
     kramdown (1.17.0)
@@ -109,6 +102,7 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     memoist (0.16.2)
+    mercenary (0.4.0)
     middleman (5.0.0.rc.1)
       coffee-script (~> 2.2)
       haml (>= 4.0.5)
@@ -204,7 +198,6 @@ GEM
     tilt-jbuilder (0.7.1)
       jbuilder
       tilt (>= 1.3.0, < 3)
-    timers (4.3.5)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
     tzinfo (1.2.6)
@@ -240,4 +233,4 @@ DEPENDENCIES
   tilt-jbuilder
 
 BUNDLED WITH
-   2.2.33
+   2.4.22

README.md

@@ -6,6 +6,16 @@
 
 This is the [Middleman](https://middlemanapp.com)-generated [dry-rb.org website](http://dry-rb.org/).
 
+## Getting started with Docker
+
+Simply start development via docker-compose:
+
+```
+docker compose up development
+```
+
+WARNING: this *takes a while* because it downloads docsite repos for all the dry-rb gems and all their versions. See container logs to watch progress.
+
 ## Getting started
 
 Install the gem and NPM dependencies:

bin/docker

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -e
+
+# Install gems
+bundle check || bundle install --jobs 4 --retry 3
+
+# Install node modules
+npm install --prefer-offline --no-audit
+
+# Symlink docsites from dry-rb repos
+bundle exec rake projects:symlink
+
+# Start middleman server
+bundle exec middleman server --verbose

docker-compose.yml

@@ -0,0 +1,14 @@
+version: "3"
+
+services:
+  development:
+    build: .
+    entrypoint: bin/docker
+    volumes:
+      - .:/app
+      - bundle:/usr/local/bundle
+    ports:
+      - "4567:4567"
+
+volumes:
+  bundle: