Added myadmin flavour

myadmin/.env_default

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+CONTAINER_NAME=TheNameOfYourContainer
+MYSQL_ROOT_PASSWORD=YourMySQLRootPasswordHere
+MYSQL_USER=wpuser
+MYSQL_PASSWORD=The_wpuser_password_here
+MYSQL_WP_DATABASE=wordpressdb
+EX_PORT=8000
+MY_PORT=8100
+

myadmin/README.md

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+INSTRUCTIONS
+
+1. Copy (and edit) .env_default to .env
+2. Run docker-compose
+3. Access the system in https://hostname:$EX_PORT
+4. Follow the system instructions to install WP
+5. Have fun!
+
+If you need to access the phpMyAdmin just point your browser to http://hostname:$MY_PORT
+
+.env VARIABLES
+
+The variables in the .env file are:
+CONTAINER_NAME: represents the sufix of the containers created
+MYSQL_ROOT_PASSWORD: the root password for the MySQL database
+MYSQL_USER: the user to own the wordpress database
+MYSQL_PASSWORD: the password for the MYSQL_USER
+MYSQL_WP_DATABASE: the wordpress database name
+EX_PORT: the port to access the wordpress
+MY_PORT: the port to access the phpMyAdmin

myadmin/docker-compose.yml

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+version: '3'
+
+services:
+  db:
+    image: mysql:8.0
+    container_name: "${CONTAINER_NAME}_db"
+    restart: unless-stopped
+    env_file: .env
+    environment:
+      - MYSQL_DATABASE=$MYSQL_WP_DATABASE
+    volumes:
+      - ./dbdata:/var/lib/mysql
+    command: '--default-authentication-plugin=mysql_native_password'
+
+  wordpress:
+    depends_on:
+      - db
+    image: wordpress
+    container_name: "${CONTAINER_NAME}_wp"
+    restart: unless-stopped
+    env_file: .env
+    ports:
+       - $EX_PORT:80
+    environment:
+      - WORDPRESS_DB_HOST=db:3306
+      - WORDPRESS_DB_USER=$MYSQL_USER
+      - WORDPRESS_DB_PASSWORD=$MYSQL_PASSWORD
+      - WORDPRESS_DB_NAME=$MYSQL_WP_DATABASE
+    volumes:
+      - ./wordpress:/var/www/html
+
+  phpmyadmin:
+     depends_on:
+       - db
+     image: phpmyadmin/phpmyadmin
+     container_name: "${CONTAINER_NAME}_myadmin"
+     restart: unless-stopped
+     ports:
+         - $MY_PORT:80
+     env_file: .env 
+     environment:
+         MYSQL_USER: $MYSQL_USER
+         MYSQL_PASSWORD: $MYSQL_PASSWORD
+         MYSQL_ROOT_PASSWORD: $MYSQL_ROOT_PASSWORD