fix: sed replacement

Signed-off-by: rare-magma <rare-magma@posteo.eu>

Dockerfile

@@ -2,8 +2,8 @@ FROM alpine:3.20
 
 RUN apk add php83 php83-fpm php83-dom php83-curl php83-json php83-openssl nginx --no-cache
 RUN sed -i '/user nginx;/d' /etc/nginx/nginx.conf \
-    && sed -i 's/user = nobody/; user = nobody/' /etc/php83/php-fpm.d/www.conf \
-    && sed -i 's/group = nobody/; group = nobody/' /etc/php83/php-fpm.d/www.conf \
+    && sed -i 's/^user = nobody/; user = nobody/' /etc/php83/php-fpm.d/www.conf \
+    && sed -i 's/^group = nobody/; group = nobody/' /etc/php83/php-fpm.d/www.conf \
     && sed -i 's/listen = 127.0.0.1:9000/listen = \/run\/php-fpm83.sock/' /etc/php83/php-fpm.d/www.conf \
     && sed -i 's/;listen.owner = nobody/listen.owner = nginx/' /etc/php83/php-fpm.d/www.conf \
     && sed -i 's/;listen.group = nobody/listen.group = nginx/' /etc/php83/php-fpm.d/www.conf \