fix: let wallabag entrypoint provision the database so the install runs

The template deployed but returned a persistent HTTP 500: MARIADB_DATABASE
pre-created the wallabag database, so the image entrypoint detected an
existing database, skipped bin/console wallabag:install and left an empty
schema. Only MARIADB_ROOT_PASSWORD is set now, letting the entrypoint
create the database/user and run the installer on first boot (matching the
official wallabag docker-compose).

Also:
- build SYMFONY__ENV__DOMAIN_NAME from the generated domain with the http
  scheme so assets/redirects match how the domain is served
- point SYMFONY__ENV__REDIS_HOST at the wallabag-redis service (default is
  'redis', which does not resolve here)
- randomize SYMFONY__ENV__SECRET instead of relying on the image's
  hardcoded default

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

blueprints/wallabag/docker-compose.yml

@@ -25,6 +25,8 @@ services:
       - SYMFONY__ENV__FROM_EMAIL=${SYMFONY__ENV__FROM_EMAIL}
       - SYMFONY__ENV__DOMAIN_NAME=${SYMFONY__ENV__DOMAIN_NAME}
       - SYMFONY__ENV__SERVER_NAME=${SYMFONY__ENV__SERVER_NAME}
+      - SYMFONY__ENV__SECRET=${SYMFONY__ENV__SECRET}
+      - SYMFONY__ENV__REDIS_HOST=wallabag-redis
     volumes:
       - wallabag-images:/var/www/wallabag/web/assets/images
 
@@ -32,10 +34,11 @@ services:
     image: mariadb:11.4
     restart: unless-stopped
     environment:
+      # Only the root password is set on purpose: the wallabag entrypoint
+      # creates the database and user and runs `wallabag:install` itself.
+      # Pre-creating the database (MARIADB_DATABASE) makes the entrypoint
+      # skip the install, leaving an empty schema and a persistent HTTP 500.
       - MARIADB_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
-      - MARIADB_DATABASE=wallabag
-      - MARIADB_USER=wallabag
-      - MARIADB_PASSWORD=${SYMFONY__ENV__DATABASE_PASSWORD}
     volumes:
       - wallabag-db-data:/var/lib/mysql
     healthcheck:

blueprints/wallabag/template.toml

@@ -2,6 +2,7 @@
 main_domain = "${domain}"
 db_root_password = "${password:32}"
 db_password = "${password:32}"
+app_secret = "${password:32}"
 from_email = "wallabag@example.com"
 
 [config]
@@ -13,6 +14,7 @@ host = "${main_domain}"
 [config.env]
 MYSQL_ROOT_PASSWORD = "${db_root_password}"
 SYMFONY__ENV__DATABASE_PASSWORD = "${db_password}"
-SYMFONY__ENV__DOMAIN_NAME = "https://${main_domain}"
+SYMFONY__ENV__DOMAIN_NAME = "http://${main_domain}"
 SYMFONY__ENV__FROM_EMAIL = "${from_email}"
 SYMFONY__ENV__SERVER_NAME = "wallabag"
+SYMFONY__ENV__SECRET = "${app_secret}"