fix(kener): define REDIS_URL and drop unused databases

Kener v4 requires Redis for its BullMQ queues, caching and scheduler,
so the app crashed on startup with "REDIS_URL is not defined in
environment variables" right after printing that it was running
(issue #976). The template also spun up both a postgres and a mariadb
container while DATABASE_URL pointed at SQLite, so neither database
was ever used (issue #282).

Changes, aligned with the upstream docker-compose.yml
(rajnandan1/kener):

- Add a redis:7-alpine service with a healthcheck and persistent
  volume, wire REDIS_URL=redis://redis:6379 and make kener depend on
  redis being healthy
- Remove the unused postgres and mysql services plus their env vars
  and generated passwords; keep SQLite (upstream default) persisted
  in the kener_db volume
- Set ORIGIN to https://<domain> instead of http://localhost:3000 so
  CSRF protection works behind the generated domain
- Drop the stale /app/uploads bind mount (kener v4 only persists
  /app/database) and the obsolete compose version key

Deploy-tested on a Dokploy instance: migrations and seed complete,
schedulers start, "Kener version 4.1.2 is running!", HTTP 200 on the
generated domain, both containers stable.

Closes #976
Closes #282

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

blueprints/kener/docker-compose.yml

@@ -1,39 +1,35 @@
-version: "3.8"
-
 services:
   kener:
     image: rajnandan1/kener:latest
     environment:
       - TZ=${TZ}
       - KENER_SECRET_KEY=${KENER_SECRET_KEY} # 🔐 API key / secret
+      - ORIGIN=${ORIGIN}
+      - REDIS_URL=${REDIS_URL}
       - DATABASE_URL=${DATABASE_URL}
       - KENER_BASE_PATH=${KENER_BASE_PATH}
-      - ORIGIN=${ORIGIN}
       - RESEND_API_KEY=${RESEND_API_KEY} # 🔐 API key
       - RESEND_SENDER_EMAIL=${RESEND_SENDER_EMAIL}
     ports:
       - 3000
     volumes:
       - kener_db:/app/database
-      - ../files/uploads:/app/uploads
+    depends_on:
+      redis:
+        condition: service_healthy
     restart: unless-stopped
 
-  postgres:
-    image: postgres:alpine
-    environment:
-      - POSTGRES_USER=${POSTGRES_USER}
-      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD} # 🔐 DB password
-      - POSTGRES_DB=${POSTGRES_DB}
-    restart: unless-stopped
-
-  mysql:
-    image: mariadb:11
-    environment:
-      - MYSQL_USER=${MYSQL_USER}
-      - MYSQL_PASSWORD=${MYSQL_PASSWORD} # 🔐 DB password
-      - MYSQL_DATABASE=${MYSQL_DATABASE}
-      - MYSQL_RANDOM_ROOT_PASSWORD=true
+  redis:
+    image: redis:7-alpine
+    volumes:
+      - kener_redis:/data
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
     restart: unless-stopped
 
 volumes:
   kener_db: {}
+  kener_redis: {}

blueprints/kener/template.toml

@@ -1,8 +1,6 @@
 [variables]
 main_domain = "${domain}"
 KENER_SECRET_KEY = "${password:64}"
-POSTGRES_PASSWORD = "${password:32}"
-MYSQL_PASSWORD = "${password:32}"
 
 [config]
 [[config.domains]]
@@ -13,25 +11,9 @@ host = "${main_domain}"
 [config.env]
 TZ = "Etc/UTC"
 KENER_SECRET_KEY = "${KENER_SECRET_KEY}" # 🔐 API key / secret
+ORIGIN = "https://${main_domain}"
+REDIS_URL = "redis://redis:6379"
 DATABASE_URL = "sqlite://./database/kener.sqlite.db"
 KENER_BASE_PATH = ""
-ORIGIN = "http://localhost:3000"
 RESEND_API_KEY = ""
 RESEND_SENDER_EMAIL = "Accounts <accounts@resend.dev>"
-POSTGRES_USER = "user"
-POSTGRES_DB = "kener_db"
-MYSQL_USER = "user"
-MYSQL_DATABASE = "kener_db"
-MYSQL_RANDOM_ROOT_PASSWORD = "true"
-MYSQL_PASSWORD = "${MYSQL_PASSWORD}" # 🔐 DB password
-POSTGRES_PASSWORD = "${POSTGRES_PASSWORD}" # 🔐 DB password
-
-[[config.mounts]]
-type = "volume"
-source = "kener_db"
-target = "/app/database"
-
-[[config.mounts]]
-type = "bind"
-source = "../files/uploads"
-target = "/app/uploads"