Merge branch 'Gemfile' into 'main'

Add possiblity to extend Schleuder-Web with additional gems

See merge request !117

Gemfile

@@ -37,3 +37,7 @@ group :test do
   gem 'sinatra'
   gem 'launchy'
 end
+
+Dir['Gemfile.local*'].each do |file|
+  eval_gemfile file
+end