fix spaces

Author: zxpower

Dockerfile

@@ -64,7 +64,7 @@ RUN set -eux; \
 	\
 	mkdir -p /usr/src; \
 	cd /usr/src; \
-        \
+	\
 	curl -fsSL -o php.tar.xz "$PHP_URL"; \
 	\
 	if [ -n "$PHP_SHA256" ]; then \