Update docker-compose.yml for new image

Delete Dockerfile
Set proper scss directory for scss-lint
Set :scss_lint to lint proper dummy directory
Add dockerignore file for not add certain files/directories to shared volume

.dockerignore

@@ -0,0 +1,2 @@
+coverage/
+docker-compose.yml

.scss-lint.yml

@@ -1,8 +1,7 @@
 # See http://sass-guidelin.es/#zeros
 
 scss_files:
-  - 'app/assets/stylesheets/**/*.scss'
-  - 'client/assets/stylesheets/**/*.scss'
+  - 'spec/dummy/app/assets/stylesheets/**/*.scss'
 
 linters:
 #  BangFormat:

Rakefile

@@ -50,7 +50,7 @@ namespace :lint do
 
   desc "Run scss-lint as shell"
   task :scss do
-    sh "scss-lint ."
+    sh "scss-lint spec/dummy/app/assets/stylesheets/"
   end
 
   desc "Run eslint as shell"
@@ -64,7 +64,7 @@ namespace :lint do
   end
 
   desc "Run all eslint, jscs, rubocop linters. Skip ruby-lint and scss"
-  task lint: [:eslint, :jscs, :rubocop] do
+  task lint: [:eslint, :jscs, :rubocop, :scss] do
     puts "Completed all linting"
   end
 end

docker-compose.yml

@@ -1,5 +1,5 @@
 lint:
-  build: .
+  image: dylangrafmyre/docker-lint
   working_dir: /app/
   volumes:
     - '.:/app/'