Fixed alpine image not building due to forgotten ONBUILD instructions

Signed-off-by: Moritz Friedrich <moritz@matchory.com>

Author: Radiergummi

alpine.Dockerfile

@@ -144,11 +144,6 @@ VOLUME /var/run/php
 VOLUME /app
 EXPOSE 9000
 
-ONBUILD ARG user="php"
-ONBUILD ARG uid="5000"
-ONBUILD USER "${uid}:${uid}"
-ONBUILD WORKDIR "/app"
-
 FROM base AS dev
 ENV COMPOSER_ALLOW_SUPERUSER="1"
 ENV PHP_OPCACHE_VALIDATE_TIMESTAMPS="1"