message: standardize on config:ember
  This was breaking things -- no reason to keep the old behavior even without the containerized flag.
diff: @@ -10,18 +10,12 @@ const log = logger('server');
  async function wireItUp(projectDir, encryptionKeys, seedModels, opts = {}) {
  let registry = new Registry();
  - if (opts.containerized) {
  registry.register('config:project', {
  path: projectDir,
  allowDevDependencies: opts.allowDevDependencies
  });
  + if (opts.emberConfigEnv) {
  registry.register('config:ember', opts.emberConfigEnv);
  - } else {
  - registry.register('config:project', {
  - path: projectDir,
  - allowDevDependencies: opts.allowDevDependencies,
  - emberConfigEnv: opts.emberConfigEnv
  - });
  }
  registry.register('config:seed-models', seedModels);
  registry.register('config:encryption-key', encryptionKeys);
  