add docker development files (#4)

* [skip travis] add docker development files

* move entrypoint to compose file

* [skip travis] exclude dev from spec.files

* use a docker managed volume for bundler

avoids permission issues with non-root user

README.md

@@ -30,7 +30,20 @@ After checking out the repo, run `bin/setup` to install dependencies. Then, run
 
 To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
 
+### With Docker
+
+You will find docker files in the `dev` directory. Edit the `docker-compose.yaml` to suit your existing setup.
+To build the image, run;
+```
+docker-compose build
+```
+Then open a shell into the container with;
+```
+docker-compose run air bash
+``` 
+`docker-compose up` will run the tests and exit.
+
 ## Contributing
 
-Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/active_interaction_rails.
+Bug reports and pull requests are welcome on GitHub at https://github.com/NgariNdungu/active_interaction_rails.
 

active_interaction_rails.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |spec|
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
   spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
-    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features|dev)/}) }
   end
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }

dev/Dockerfile

@@ -0,0 +1,7 @@
+FROM ruby:2.7.0-slim-buster
+RUN apt-get update \
+      && apt-get install -yq --no-install-recommends build-essential libsqlite3-dev git curl \
+      && rm -rf /var/lib/apt/lists/*
+RUN adduser dev --system --group --uid 1000
+USER dev:dev
+RUN gem install rails --version '~> 6.0' --no-document

dev/docker-compose.yaml

@@ -0,0 +1,17 @@
+---
+version: "3.7"
+services:
+  air:
+    build:
+      context: ../
+      dockerfile: dev/Dockerfile
+    image: ngarindungu/rails-dev
+    entrypoint: ["/bin/bash", "dev/entrypoint.sh"]
+    command: "bundle exec rake"
+    working_dir: /home/dev/active_interaction_rails
+    volumes:
+      - ../:/home/dev/active_interaction_rails
+      - bundle:/usr/local/bundle
+
+volumes:
+  bundle:

dev/entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+# clear pid before starting server
+rm -f tmp/pids/server.pid
+# check if Gemfile has changed and bundle
+if [[ -e "Gemfile" ]]; then
+  bundle check || bundle install
+fi
+# execute commands
+exec "$@"