Make gem releasable without bundling

.codeclimate.yml

@@ -1,7 +1,5 @@
 ---
 engines:
-  bundler-audit:
-    enabled: true
   duplication:
     enabled: true
     config:

.gitignore

@@ -6,3 +6,4 @@ coverage/
 /spec/reports
 /spec/support/last_execution_examples_result.txt
 .tags_sorted_by_file
+/Gemfile.lock

Rakefile

@@ -1,10 +1,10 @@
 #!/usr/bin/env rake
-require 'bundler/gem_tasks'
-
-require 'rspec/core/rake_task'
 
-require 'cassette/version'
+require 'bundler/gem_tasks'
 
-RSpec::Core::RakeTask.new(:spec) do |task|
-  task.rspec_opts = '--format RspecJunitFormatter  --out spec/reports/rspec.xml --format documentation --color'
+if defined?(RSpec)
+  require 'rspec/core/rake_task'
+  RSpec::Core::RakeTask.new(:spec) do |task|
+    task.rspec_opts = '--format RspecJunitFormatter  --out spec/reports/rspec.xml --format documentation --color'
+  end
 end

docker-release.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+RELEASE_ARGS="${@:-rake release}"
+IMAGE=ruby:2.6
+
+docker run -it --rm \
+  -w /app \
+  -v $(pwd):/app \
+  -v $HOME/.gem:/root/.gem \
+  $IMAGE \
+  $RELEASE_ARGS