added builder script

mariadb/README.md

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+# Mariadb
+
+Dockerhub: https://hub.docker.com/_/mariadb
+
+It will be quite uncommon to just use this compose file, it's likely you are extending this from another project.
+That's the main context of this container.
+
+## Sample 
+
+### Run multiple databases 
+
+initdb/init.sql
+
+```sql
+
+-- Create BookStack database and user
+CREATE DATABASE IF NOT EXISTS bookstack_db;
+CREATE USER IF NOT EXISTS 'bookstack_user'@'%' IDENTIFIED BY 'bookstack_password';
+GRANT ALL PRIVILEGES ON bookstack_db.* TO 'bookstack_user'@'%';
+
+-- Create WordPress database and user
+CREATE DATABASE IF NOT EXISTS wordpress_db;
+CREATE USER IF NOT EXISTS 'wordpress_user'@'%' IDENTIFIED BY 'wordpress_password';
+GRANT ALL PRIVILEGES ON wordpress_db.* TO 'wordpress_user'@'%';
+
+FLUSH PRIVILEGES;
+```

mariadb/docker-compose.yml

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+version: '3.8'  # or any version you prefer
+
+services:
+  mariadb:
+    image: ${MARIADB_IMAGE:-mariadb:latest}
+    environment:
+      MARIADB_ROOT_PASSWORD: ${MARIADB_ROOT_PASSWORD:-ChangeThisPassword}
+      MARIADB_DATABASE: ${MARIADB_DATABASE:-mydb}
+      MARIADB_USER: ${MARIADB_USER:-dbuser}
+      MARIADB_PASSWORD: ${MARIADB_PASSWORD:-AlsoChangeThisPassword}
+    volumes:
+      - ${VOL_PATH:-./data/}mariadb_data:/var/lib/mysql
+    ports:
+      - "3306:3306"
+    networks:
+      - mariadb_network
+

mariadb/sample-extends.yml

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+version: '3.4'
+
+services:	
+	mariadb:
+		extends:
+			file: ${COOKBOOK}/mariadb/docker-compose.yml
+			service: mariadb

mariadb/sample.env

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+# Mariadb
+PRODDIR=/var/www/stashdomain-com/ #HELP: project_path
+COOKBOOK=/home/user/git/docker-compose-cookbooks #HELP: cookbooks
+VOL_PATH=/project-dir/project-name/data #HELP: volpath
+MARIADB_IMAGE=mariadb:latest
+MARIADB_ROOT_PASSWORD=ChangeThisPassword #HELP: gen32
+MARIADB_DATABASE=mydb
+MARIADB_USER=dbuser
+MARIADB_PASSWORD=AlsoChangeThisPassword #HELP: gen32