Dockerfile: extension AST inutile

Dockerfile

@@ -21,9 +21,6 @@ RUN apt-get update -qq && \
         sqlite3 \
         php${PHP_VERSION}-pdo-sqlite
 
-RUN pecl install ast && \
-    echo "extension=ast.so" > ${PHP_CONF_DIR}/cli/conf.d/ast.ini
-
 # Nettoyage
 RUN apt-get autoremove -y && apt-get clean && rm -rf /tmp/* /var/tmp/*