alpine fix worker_processes to "auto"

Dockerfile.alpine

@@ -8,7 +8,8 @@ RUN apk add --no-cache --virtual .run-deps \
 
 # Configure Nginx and apply fix for very long server names
 RUN echo "daemon off;" >> /etc/nginx/nginx.conf \
- && sed -i 's/^http {/&\n    server_names_hash_bucket_size 128;/g' /etc/nginx/nginx.conf
+ && sed -i 's/^http {/&\n    server_names_hash_bucket_size 128;/g' /etc/nginx/nginx.conf \
+ && sed -i 's/worker_processes  1/worker_processes  auto/' /etc/nginx/nginx.conf
 
 # Install Forego
 ADD https://github.com/jwilder/forego/releases/download/v0.16.1/forego /usr/local/bin/forego