debian build env is not a git repo

Forwarded: not-needed

--- a/sentry-ruby.gemspec
+++ b/sentry-ruby.gemspec
@@ -11,7 +11,7 @@
   spec.platform = Gem::Platform::RUBY
   spec.required_ruby_version = '>= 2.4'
   spec.extra_rdoc_files = ["README.md", "LICENSE.txt"]
-  spec.files = `git ls-files | grep -Ev '^(spec|benchmarks|examples)'`.split("\n")
+  spec.files = Dir.glob('lib/**/*')
 
   github_root_uri = 'https://github.com/getsentry/sentry-ruby'
   spec.homepage = "#{github_root_uri}/tree/#{spec.version}/#{spec.name}"