Added Classicpress as a service

Wordpress alternative without block editor (Gutenberg), Useful for small sites & lightweight blogs.

PR includes 3 version's with or without database, also logo.svg

templates/compose/classicpress-with-mariadb.yaml

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+# documentation: https://www.classicpress.net/
+# slogan: ClassicPress with external database. Classicpress A lightweight, stable, instantly familiar free open-source content management system. Based on WordPress without the block editor (Gutenberg).
+# tags: cms, blog, content, management
+# logo: svgs/classicpress.svg
+
+services:
+   wordpress:
+     image: classicpress/classicpress:latest
+     volumes:
+       - classicpress-files:/var/www/html
+     environment:
+       - SERVICE_FQDN
+       - CLASSICPRESS_DB_HOST=mariadb
+       - CLASSICPRESS_DB_USER=$SERVICE_USER_CLASSICPRESS
+       - CLASSICPRESS_DB_PASSWORD=$SERVICE_PASSWORD_CLASSICPRESS
+       - CLASSICPRESS_DB_NAME=classicpress
+     depends_on:
+       - mariadb
+
+   mariadb:
+     image: mariadb:11
+     volumes:
+       - mariadb-data:/var/lib/mysql
+     environment:
+       - MYSQL_ROOT_PASSWORD=$SERVICE_PASSWORD_ROOT
+       - MYSQL_DATABASE=classicpress
+       - MYSQL_USER=$SERVICE_USER_CLASSICPRESS
+       - MYSQL_PASSWORD=$SERVICE_PASSWORD_CLASSICPRESS

templates/compose/classicpress-with-mysql.yaml

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+# documentation: https://www.classicpress.net/
+# slogan: ClassicPress with external database. Classicpress A lightweight, stable, instantly familiar free open-source content management system. Based on WordPress without the block editor (Gutenberg).
+# tags: cms, blog, content, management
+# logo: svgs/classicpress.svg
+
+services:
+   wordpress:
+     image: classicpress/classicpress:latest
+     volumes:
+       - classicpress-files:/var/www/html
+     environment:
+       - SERVICE_FQDN
+       - CLASSICPRESS_DB_HOST=mysql
+       - CLASSICPRESS_DB_USER=$SERVICE_USER_CLASSICPRESS
+       - CLASSICPRESS_DB_PASSWORD=$SERVICE_PASSWORD_CLASSICPRESS
+       - CLASSICPRESS_DB_NAME=classicpress
+     depends_on:
+       - mysql
+
+   mariadb:
+     image: mysql:5.7
+     volumes:
+       - mysql-data:/var/lib/mysql
+     environment:
+       - MYSQL_ROOT_PASSWORD=$SERVICE_PASSWORD_ROOT
+       - MYSQL_DATABASE=classicpress
+       - MYSQL_USER=$SERVICE_USER_CLASSICPRESS
+       - MYSQL_PASSWORD=$SERVICE_PASSWORD_CLASSICPRESS

templates/compose/classicpress-without-database.yaml

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+# documentation: https://www.classicpress.net/
+# slogan: ClassicPress with external database. Classicpress A lightweight, stable, instantly familiar free open-source content management system. Based on WordPress without the block editor (Gutenberg).
+# tags: cms, blog, content, management
+# logo: svgs/classicpress.svg
+
+services:
+   wordpress:
+     image: classicpress/classicpress:latest
+     volumes:
+       - classicpress-files:/var/www/html
+     environment:
+       - SERVICE_FQDN