Fix: Resolved Discourse plugin bug and unified variable/path handling

- Discourse: fixed 'DISCOURSE_CONTAINERS_DIR' and 'DISCOURSE_APPLICATION_YML_DEST'
- Nextcloud: improved plugin enable/configure tasks formatting
- WordPress: unified OIDC, msmtp, and upload.ini variables and tasks
- General: aligned spacing and switched to path_join for consistency

roles/web-app-wordpress/templates/Dockerfile.j2

@@ -11,4 +11,4 @@ RUN curl -O https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli
     mv wp-cli.phar /usr/local/bin/wp
 
 # Copy PHP upload settings
-COPY upload.ini $PHP_INI_DIR/conf.d/
+COPY {{ WORDPRESS_CONFIG_UPLD_REL }} $PHP_INI_DIR/conf.d/

roles/web-app-wordpress/templates/docker-compose.yml.j2

@@ -10,7 +10,7 @@
       - "127.0.0.1:{{ ports.localhost.http[application_id] }}:80"
     volumes:
       - data:{{ WORDPRESS_DOCKER_HTML_PATH }}
-      - {{ WORDPRESS_HOST_MSMTP_CONF }}:/etc/msmtprc
+      - {{ WORDPRESS_MSMTP_ABS }}:/etc/msmtprc
 
 {% include 'roles/docker-container/templates/healthcheck/msmtp_curl.yml.j2' %}
 {% include 'roles/docker-container/templates/depends_on/dmbs_excl.yml.j2' %}