feat: multisite with sufolders (#35)

With this commit multisite now also works with subpaths instead of subdomains.

It also simpified the multisite deployment in generall by adding a new MULTISITE environment variable. Depending on its value WORDPRESS_CONFIG_EXTRA gets set in the entrypoint. And the correct .htaccess gets deployed.

Closes #34

I am still new to coopcloud and welcome feedback on my approach. The second commit is not required for #34 so I can remove it again.

Reviewed-on: https://git.coopcloud.tech/coop-cloud/wordpress/pulls/35
Co-authored-by: p4u1 <p4u1_f4u1@riseup.net>
Co-committed-by: p4u1 <p4u1_f4u1@riseup.net>

compose.yml

@@ -31,6 +31,8 @@ services:
       - source: entrypoint_conf
         target: /docker-entrypoint.sh
         mode: 0555
+      - source: htaccess_conf
+        target: /var/www/html/.htaccess
     entrypoint: /docker-entrypoint.sh
     depends_on:
       - db
@@ -108,3 +110,7 @@ configs:
   php_uploads_conf:
     name: ${STACK_NAME}_php_uploads_conf_${PHP_UPLOADS_CONF_VERSION}
     file: uploads.ini
+  htaccess_conf:
+    name: ${STACK_NAME}_htaccess_conf_${HTACCESS_CONF_VERSION}
+    file: htaccess.tmpl
+    template_driver: golang