Support alternative http code for PUT, PATCH and DELETE methods

Fix to see X-Forwarded-Proto for redirect scheme

allow overriding the default access log and error log locations

allow 301, 302, 303, 307 or 308 as HTTP Status Codes used for redirect

optionally define different status code for POST requests, cherry picked from https://github.com/schmunk42/docker-nginx-redirect/pull/8

Add SERVER_NAME variable

remove shells to make nginx the main process of the container