feat: add Dockerized testing

Author: maxday

.gitignore

@@ -11,3 +11,5 @@ test/examples/hello-world-docker/pkg
 *.iml
 .DS_Store
 Gemfile.lock
+# useful when using rbenv
+.ruby-version

Dockerfile.test

@@ -0,0 +1,6 @@
+FROM public.ecr.aws/lambda/ruby:3.3
+ENV GEM_HOME=/var/runtime
+RUN gem uninstall aws_lambda_ric --executables
+ADD pkg /tmp/pkg
+RUN gem install /tmp/pkg/aws_lambda_ric-*.gem
+RUN rm -rf /tmp/pkg