Allow composer install with --classmap-authoritative during deploy

See:
- https://getcomposer.org/doc/articles/autoloader-optimization.md#optimization-level-2-a-authoritative-class-maps
- https://docs.ansible.com/ansible/latest/modules/composer_module.html#parameters

CHANGELOG.md

@@ -1,5 +1,6 @@
 ### Head
 * Update `wp_cli_version` to 2.4.0 ([#1131](https://github.com/roots/trellis/pull/1131))
+* Allow `composer install` with `--classmap-authoritative` during deploy ([#1132](https://github.com/roots/trellis/pull/1132))
 
 ### 1.3.0: December 7th, 2019
 * Add `git_sha` and `release_version` to `.env` on deploy ([#1124](https://github.com/roots/trellis/pull/1124))

deploy-hooks/build-before.yml

@@ -14,7 +14,7 @@
 #     chdir: "{{ project_local_path }}/web/app/themes/sage"
 #
 # - name: Install Composer dependencies
-#   command: composer install --no-ansi --no-dev --no-interaction --no-progress --optimize-autoloader --no-scripts
+#   command: composer install --no-ansi --no-dev --no-interaction --no-progress --optimize-autoloader --no-scripts --classmap-authoritative
 #   args:
 #     chdir: "{{ deploy_helper.new_release_path }}/web/app/themes/sage"
 #

roles/deploy/defaults/main.yml

@@ -48,6 +48,9 @@ project_current_path: "{{ project.current_path | default('current') }}"
 # Whether to run `wp core update-db` at end of each deploy
 update_db_on_deploy: true
 
+# Whether to autoload classes from classmap only.
+composer_classmap_authoritative: false
+
 # Helpers
 project: "{{ wordpress_sites[site] }}"
 project_root: "{{ www_root }}/{{ site }}"

roles/deploy/hooks/build-after.yml

@@ -27,5 +27,6 @@
 
 - name: Install Composer dependencies
   composer:
+    classmap_authoritative: "{{ composer_classmap_authoritative }}"
     no_scripts: yes
     working_dir: "{{ deploy_helper.new_release_path }}"