Adds dynamic ARG for Dockerfile FROM

Dockerfile.wordpress_fpm

@@ -1,7 +1,8 @@
 # Wordpress - make a copy of wp-includes to compare with existing volumes
 
 # 'docker-compose exec wordpress bash -c 'cd /var/www/html/wp-includes && grep wp_version version.php'
-FROM wordpress:6-fpm
+ARG WORDPRESS_VERSION=user-defined
+FROM wordpress:${WORDPRESS_VERSION}
 
 # ancient debian
 #RUN apt update && apt -y install vim less 

docker-compose.first.yml

@@ -7,6 +7,8 @@ services:
     build:
       context: .
       dockerfile: Dockerfile.wordpress_fpm
+      args:
+        WORDPRESS_VERSION: ${WORDPRESS_VERSION}    
     image: ${IMAGE_WEB:-web}       
     volumes:
       - html:/var/www/html