Execute SQL in entrypoint with "--comments"

The primary reason to disable this seems to be to avoid normally-unnecessary data transfer, but in this case we're explicitly connecting over the local unix socket, so streaming the comments to the server and letting it strip them should be *almost* as efficient as the client doing so.

Author: marc-mabe

5.6/docker-entrypoint.sh

@@ -208,7 +208,7 @@ docker_process_sql() {
 		set -- --database="$MYSQL_DATABASE" "$@"
 	fi
 
-	mysql --defaults-extra-file=<( _mysql_passfile "${passfileArgs[@]}") --protocol=socket -uroot -hlocalhost --socket="${SOCKET}" "$@"
+	mysql --defaults-extra-file=<( _mysql_passfile "${passfileArgs[@]}") --protocol=socket -uroot -hlocalhost --socket="${SOCKET}" --comments "$@"
 }
 
 # Initializes database with timezone info and root password, plus optional extra db/user