fix(debug): make sure it fallbacks on stderr anyway

Author: Thomas Dalous

clients/algoliasearch-client-ruby/lib/algolia/logger_helper.rb

@@ -5,8 +5,17 @@ class LoggerHelper
     # @param debug_file [nil|String] file used to output the logs
     #
     def self.create(debug_file = nil)
-      file = debug_file || (ENV["ALGOLIA_DEBUG"] ? File.new("debug.log", "a+") : $stderr)
-      instance = ::Logger.new(file)
+      file = debug_file
+
+      if file.nil? && ENV["ALGOLIA_DEBUG"]
+        begin
+          file = File.new("debug.log", "a+")
+        rescue Errno::EACCES, Errno::ENOENT => e
+          puts "Failed to open debug.log: #{e.message}. Falling back to $stderr."
+        end
+      end
+
+      instance = ::Logger.new(file || $stderr)
       instance.progname = "algolia"
       instance
     end