feat: add --gpg-sign option on commits (#518)

Add --gpg-sign option on commits

Signed-off-by: othmane399 <othmane.elmassari@doctolib.com>

lib/git/lib.rb

@@ -646,6 +646,7 @@ def remove(path = '.', opts = {})
     #  :date
     #  :no_verify
     #  :allow_empty_message
+    #  :gpg_sign
     #
     # @param [String] message the commit message to be used
     # @param [Hash] opts the commit options to be used
@@ -659,6 +660,7 @@ def commit(message, opts = {})
       arr_opts << "--date=#{opts[:date]}" if opts[:date].is_a? String
       arr_opts << '--no-verify' if opts[:no_verify]
       arr_opts << '--allow-empty-message' if opts[:allow_empty_message]
+      arr_opts << '--gpg-sign' if opts[:gpg_sign] == true || "--gpg-sign=#{opts[:gpg_sign]}" if opts[:gpg_sign]
 
       command('commit', arr_opts)
     end