Fixing chmod permissions under root user

Dockerfile

@@ -1,6 +1,10 @@
 FROM wordpress:apache
 LABEL maintainer="Shanti Naik <visitsb@gmail.com>"
 
+# https://serverfault.com/a/960335
+# chmod doesn't work correctly
+USER root
+
 # Our script that enables hosting Wordpress in a subfolder
 # Script name is 'intentional' - has to start with apache2* to allow
 # Wordpress ENTRYPOINT ["docker-entrypoint.sh"] to execute it's logic before
@@ -16,6 +20,8 @@ COPY apache2-wordpress.sh /usr/local/bin/
 # to explicitly specify CMD).
 # https://github.com/moby/moby/issues/5147
 
+RUN /bin/chmod +x /usr/local/bin/apache2-wordpress.sh
+
 # When environment variable WORDPRESS_ROOTDIR is set
 # The subfolder will be created under default Wordpress root dir
 CMD ["apache2-wordpress.sh"]