adds a common wp cli cache volume

create.sh

 echo "Setting up docker volume and network...";
 docker volume create $PREFIX-web;
 docker volume create $PREFIX-db;
+docker volume create wp-cli-cache;
 docker network create $PREFIX;
-docker network connect $PREFIX traefik;
 
 docker-compose up -d web;
 while ! docker ps -q -f name=$PREFIX-web; do
     wp theme install $THEME \
         --activate \
         --path=/var/www/html";
+docker network connect $PREFIX traefik;

docker-compose.yml

       - traefik.http.services.${PREFIX}-web.loadbalancer.server.port=80
     volumes:
       - web:/var/www/html
+      - wp-cli-cache:/var/www/.wp-cli
 
 version: "3.4"
 
     name: ${PREFIX}-db
   web:
     name: ${PREFIX}-web
+  wp-cli-cache:
+    name: wp-cli-cache

purge.sh

 docker network rm $PREFIX
 docker rm $PREFIX-web
 docker rm $PREFIX-db
-docker volume rm $PREFIX-db
 docker volume rm $PREFIX-web
+docker volume rm $PREFIX-db