Add Nginx to WordPress's official FPM binaries and let users customize php settings

Dockerfile

FROM wordpress:4.9-php7.2-fpm-alpine
# Install the extra packages.
RUN apk --no-cache add nginx supervisor curl
# Copy all files.
COPY ./php.ini $PHP_INI_DIR/conf.d/wp_php.ini
COPY ./nginx.conf /etc/nginx/nginx.conf
COPY ./supervisord.conf /etc/supervisor/conf.d/supervisord.conf
# Disable default entrypoint.
ENTRYPOINT []
# Expose Nginx on 80.
EXPOSE 80
# Run the entrypoint manually. Then start Supervisor.
CMD ["sh", "-c", "docker-entrypoint.sh php-fpm -v; /usr/bin/supervisord -c /etc/supervisor/conf.d/supervisord.conf"]

nginx.conf

worker_processes 1;
pid /run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    include mime.types;
    default_type application/octet-stream;

    log_format  main_timed  '$remote_addr - $remote_user [$time_local] "$request" '
                            '$status $body_bytes_sent "$http_referer" '
                            '"$http_user_agent" "$http_x_forwarded_for" '
                            '$request_time $upstream_response_time $pipe $upstream_cache_status';

    access_log /dev/stdout main_timed;
    error_log /dev/stderr notice;

    keepalive_timeout 65;

    server_tokens off;

    # Enable gzip compression
    gzip on;
    gzip_disable "msie6";
    gzip_proxied any;

    gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript;

    # Forward the cloudfront scheme from upstream
    map "$http_cloudfront_forwarded_proto$http_x_forwarded_proto" $forwarded_scheme {
         default off;
         "~*(https)" on;
     }

    server {
        listen [::]:80 default_server;
        listen 80 default_server;
        server_name _;

        sendfile off;

        # Increase proxy buffers for large requests
        proxy_buffer_size 128k;
        proxy_buffers 4 256k;
        proxy_busy_buffers_size 256k;

        # Upload limit
        client_max_body_size 50m;
        client_body_buffer_size 128k;

        root /var/www/html;
        index index.php index.html;

        # redirect server error pages to the static page /50x.html
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
            root /var/lib/nginx/html;
        }

        location = /favicon.ico {
            log_not_found off;
            access_log off;
        }

        location = /robots.txt {
            log_not_found off;
            access_log off;
        }

        location / {
            # First attempt to serve request as file, then
            # as directory, then fall back to index.php
            try_files $uri $uri/ /index.php?$args;
        }

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        location ~ \.php$ {
            try_files $uri =404;
            fastcgi_split_path_info ^(.+\.php)(/.+)$;

            #fastcgi_intercept_errors on;
            fastcgi_buffer_size 128k;
            fastcgi_buffers 4 256k;
            fastcgi_busy_buffers_size 256k;

            fastcgi_index index.php;
            fastcgi_pass 127.0.0.1:9000;

            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            include fastcgi_params;

            # Forward the scheme from upstream
            fastcgi_param HTTPS $forwarded_scheme;
        }

        # deny access to . files, for security
        location ~ /\. {
            log_not_found off;
            deny all;
        }
    }
}

php.ini

; Don't fix path
cgi.fix_pathinfo = 0;

; File upload limit
file_uploads = On;
post_max_size = 100M;
upload_max_filesize = 50M;

; Memory limit
memory_limit = 512M;

; Set default timezone
date.timezone = "UTC";

; Hide PHP version info in response headers
expose_php = Off;

supervisord.conf

[supervisord]
nodaemon=true
logfile=/var/log/supervisord.log
pidfile=/run/supervisord.pid

[program:php-fpm]
command=php-fpm -F
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
redirect_stderr=true
autorestart=false
startretries=0

[program:nginx]
command=nginx -g 'daemon off;'
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
redirect_stderr=true
autorestart=false
startretries=0