Merge pull request #34 from Shopify/add-dev-yml

Add dev.yml so it's easier to setup locally

Author: lastgabs

dev.yml

@@ -0,0 +1,18 @@
+name: packwerk
+
+type: ruby
+
+up:
+  - ruby: 2.6.5
+  - bundler
+
+commands:
+  test:
+    run: |
+      if [[ "$#" -eq 1 && -f "$1" ]];
+      then
+        rake test TEST="$1"
+      else
+        rake test "$@"
+      fi
+  style: "bundle exec rubocop -D --auto-correct"