Use GITHUB_RUN_ID as identifier

Author: anakinj

.simplecov

@@ -6,7 +6,7 @@ require 'simplecov_json_formatter'
 SimpleCov.start do
   command_name "Job #{File.basename(ENV['BUNDLE_GEMFILE'])}" if ENV['BUNDLE_GEMFILE']
   project_name 'Ruby JWT - Ruby JSON Web Token implementation'
-  coverage_dir "coverage-#{OpenSSL::Digest::SHA256.hexdigest(ENV['GITHUB_STEP_SUMMARY'])}" if ENV['GITHUB_STEP_SUMMARY']
+  coverage_dir "coverage-#{ENV['GITHUB_RUN_ID']}" if ENV['GITHUB_RUN_ID']
   add_filter 'spec'
 end