Fixes when building with buildkit

since it doesn't have `/.dockerenv` (https://github.com/composer/composer/blob/94fe2945456df51e122a492b8d14ac4b54c1d2ce/src/Composer/Console/Application.php#L217-L218)

Author: yosifkit

10.1/php8.1/apache-bookworm/Dockerfile

@@ -93,6 +93,11 @@ COPY --from=composer:{{ .composer.version }} /usr/bin/composer /usr/local/bin/
 ENV DRUPAL_VERSION {{ .version }}
 {{ if has("composer") then ( -}}
 
+# https://github.com/moby/buildkit/issues/4503
+# https://github.com/composer/composer/issues/11854
+# https://github.com/composer/composer/blob/94fe2945456df51e122a492b8d14ac4b54c1d2ce/src/Composer/Console/Application.php#L217-L218
+ENV COMPOSER_ALLOW_SUPERUSER 1
+
 WORKDIR /opt/drupal
 RUN set -eux; \
 	export COMPOSER_HOME="$(mktemp -d)"; \