roles/php-fpm: Only run PHP tasks if we need them

Not all web hosts need this. Some are static sites, for example.

roles/php-fpm/tasks/Debian_10.yml

@@ -32,5 +32,6 @@
     template: src=php7.3-php.ini.j2 dest=/etc/php/7.3/fpm/php.ini owner=root group=root mode=0644
     notify: reload php7.3-fpm
   tags: php-fpm
+  when: (item.has_wordpress is defined and item.has_wordpress) or (item.needs_php is defined and item.needs_php)
 
 # vim: set ts=2 sw=2:

roles/php-fpm/tasks/Ubuntu_18.04.yml

@@ -32,5 +32,6 @@
     template: src=php7.2-php.ini.j2 dest=/etc/php/7.2/fpm/php.ini owner=root group=root mode=0644
     notify: reload php7.2-fpm
   tags: php-fpm
+  when: (item.has_wordpress is defined and item.has_wordpress) or (item.needs_php is defined and item.needs_php)
 
 # vim: set ts=2 sw=2:

roles/php-fpm/tasks/Ubuntu_20.04.yml

@@ -32,5 +32,6 @@
     template: src=php7.4-php.ini.j2 dest=/etc/php/7.4/fpm/php.ini owner=root group=root mode=0644
     notify: reload php7.4-fpm
   tags: php-fpm
+  when: (item.has_wordpress is defined and item.has_wordpress) or (item.needs_php is defined and item.needs_php)
 
 # vim: set ts=2 sw=2:

web.yml

@@ -6,7 +6,7 @@
   become: yes
   roles:
     - common
-    - mariadb
+    - { role: mariadb, when: mariadb_databases is defined}
     - nginx
     - php-fpm
     - munin