fix not working new installation under CentOS/RHEL caused by grant host "%"

doc/docker/docker-compose.yml

@@ -42,6 +42,8 @@ services:
     environment:
     # MariaDB/MySQL host to use: for internal service use "db", for host database (socket bind-mounted into container) use "localhost"
     - EGW_DB_HOST=db
+    # grant host is needed for NOT using localhost / unix domain socket for MySQL/MariaDB
+    - EGW_DB_GRANT_HOST="172.17.%"
     # for internal db service you should to specify a root password here AND in db service
     # a database "egroupware" with a random password is created for you on installation (password is stored in header.inc.php in data directory)
     #- EGW_DB_ROOT=root

doc/docker/fpm/entrypoint.sh

@@ -30,7 +30,7 @@ until [ -n "$EGW_SKIP_INSTALL" -a ! -f /var/lib/egroupware/header.inc.php ] || \
 	--start_db "" --autostart_db "" \
 	--db_type "${EGW_DB_TYPE:-mysqli}" \
 	--db_host "${EGW_DB_HOST:-localhost}" \
-	--db_grant_host "${EGW_DB_GRANT_HOST:-%}" \
+	--db_grant_host "${EGW_DB_GRANT_HOST:-localhost}" \
 	--db_root "${EGW_DB_ROOT:-root}" \
 	--db_root_pw   "${EGW_DB_ROOT_PW:-}" \
 	--db_name "${EGW_DB_NAME:-egroupware}" \