non-production: add buildkite.yml file

Author: yinonrousso

.buildkite/pipeline.yml

@@ -0,0 +1,8 @@
+steps:
+  - label: ":ruby: 3.0 :rspec: :rails: 7.0"
+    timeout_in_minutes: 5
+    agents:
+      queue: ruby-3-2
+    commands:
+      - bundle install
+      - bundle exec rspec