Eager load to make DEFAULTS deterministic

[michaelherold]

This is a 🐛 bug fix.

Summary

Configuration::DEFAULTS uses Dir.pwd to determine the root directory for the configuration. This means that lazy loading the file using autoload makes the root path for configuration non-deterministic depending on the directory location the first time you try to use Bridgetown::Configuration.

This has a knock-on effect of making tests fail nondeterministically.

By eager loading the configuration file, we can reduce this nondeterminism by ensuring the value is set the same way every time.

Context

This can be reproduced with the following on 7ecd7f6.

Reproduction

BYPASS_RESOURCE_TEST=true bundle exec ruby -Itest:lib -e 'require "./test/fixtures/test_automation.rb" ; require "./test/test_ansi.rb" ; require "./test/test_apply_command.rb" ; require "./test/test_cleaner.rb" ; require "./test/test_collections.rb" ; require "./test/test_components.rb" ; require "./test/test_configuration.rb" ; require "./test/test_configure_command.rb" ; require "./test/test_data_reader.rb" ; require "./test/test_defaults_reader.rb" ; require "./test/test_doctor_command.rb" ; require "./test/test_drop.rb" ; require "./test/test_entry_filter.rb" ; require "./test/test_erb.rb" ; require "./test/test_esbuild_command.rb" ; require "./test/test_filters.rb" ; require "./test/test_front_matter_defaults.rb" ; require "./test/test_generated_page.rb" ; require "./test/test_generated_site.rb" ; require "./test/test_kramdown.rb" ; require "./test/test_layout_reader.rb" ; require "./test/test_liquid_extensions.rb" ; require "./test/test_liquid_renderer.rb" ; require "./test/test_locales.rb" ; require "./test/test_log_adapter.rb" ; require "./test/test_model.rb" ; require "./test/test_new_command.rb" ; require "./test/test_path_sanitization.rb" ; require "./test/test_plugin_manager.rb" ; require "./test/test_relations.rb" ; require "./test/test_resource.rb" ; require "./test/test_ruby_helpers.rb" ; require "./test/test_serbea.rb" ; require "./test/test_site.rb" ; require "./test/test_site_drop.rb" ; require "./test/test_ssr.rb" ; require "./test/test_static_file.rb" ; require "./test/test_tags.rb" ; require "./test/test_utils.rb" ; require "./test/test_webpack_command.rb" ; require "./test/test_yaml_parser.rb"' -- -n "/^(?:TestEsbuildCommand#(?:test_: existing webpack project should migrate to esbuild. )|TestConfiguration#(?:test_: .from should merge input over defaults. ))$/" --seed 1234

Run this on that commit, then on this commit, and see that there's no longer a leak in the test. With this change, I think we can remove the SEED=2345 in script/test and go back to using random testing.