sample first version

.gitignore

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+/db
+/webroot

docker-compose.yml

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+version: '3.7'
+services:
+  nginx:
+    build: nginx/
+    container_name: nginx
+    ports:
+      - 8880:80
+    restart: always
+    volumes:
+      - ./webroot:/var/www/html
+  php-fpm:
+    build: php-fpm/
+    container_name: php-fpm
+    restart: always
+    volumes:
+      - ./webroot:/var/www/html
+  mariadb:
+    image: mariadb:10
+    restart: always
+    container_name: mariadb
+    volumes:
+      - ./db:/var/lib/mysql
+    environment:
+      MYSQL_ROOT_PASSWORD: 123456
+      MYSQL_DATABASE: wordpress

nginx/Dockerfile

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+FROM nginx:alpine
+COPY default.conf /etc/nginx/conf.d/default.conf
+RUN adduser -u 1100 -D -H web-user \
+  && sed -i -E 's/(user\s+)\w+;/\1 web-user;/' /etc/nginx/nginx.conf

nginx/default.conf

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+server {
+    listen       80;
+    server_name  localhost;
+
+    port_in_redirect off;
+    absolute_redirect off;
+    #charset koi8-r;
+    #access_log  /var/log/nginx/host.access.log  main;
+
+    root   /var/www/html;
+    index index.php index.html index.htm;
+    location / {
+      try_files $uri $uri/ =404;
+    }
+
+    #error_page  404              /404.html;
+
+    # redirect server error pages to the static page /50x.html
+    #
+    error_page   500 502 503 504  /50x.html;
+    location = /50x.html {
+        root   /usr/share/nginx/html;
+    }
+
+    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
+    #
+    #location ~ \.php$ {
+    #    proxy_pass   http://127.0.0.1;
+    #}
+
+    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
+    #
+    location ~ \.php$ {
+        #root           html;
+        fastcgi_pass   php-fpm:9000;
+        fastcgi_index  index.php;
+        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
+        include        fastcgi_params;
+    }
+
+    # deny access to .htaccess files, if Apache's document root
+    # concurs with nginx's one
+    #
+    #location ~ /\.ht {
+    #    deny  all;
+    #}
+}
+

php-fpm/Dockerfile

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+FROM php:fpm-alpine
+RUN adduser -u 1100 -D -H web-user \
+  && sed -i -E 's/(user.+=).+/\1 web-user/' /usr/local/etc/php-fpm.d/www.conf \
+  && apk add --no-cache icu-dev oniguruma-dev zlib-dev libpng-dev libzip-dev \
+  && docker-php-ext-install mysqli pdo pdo_mysql intl mbstring ctype gd json session zip