feat: add dagu blueprint

Dagu is a self-contained workflow engine with a Web UI for scheduling and
orchestrating jobs as DAGs defined in declarative YAML.

- Pin ghcr.io/dagucloud/dagu:2.10.7 and expose the Web UI on port 8080
- Set DAGU_HOST=0.0.0.0 so the service is reachable through the proxy
- Enable basic auth with a generated per-deploy admin password
- Persist /var/lib/dagu (DAGs, logs, run history) in a named volume

Claude-Session: https://claude.ai/code/session_01CRNT6sa2q2P9rUTokeoGhQ

blueprints/dagu/docker-compose.yml

@@ -0,0 +1,25 @@
+# Access the Dagu Web UI at the assigned domain.
+# Sign in with the basic auth credentials from your .env file (default user: admin).
+# Place your DAG definitions (YAML) in the dags directory via the Web UI or the API.
+
+version: "3.8"
+
+services:
+  dagu:
+    image: ghcr.io/dagucloud/dagu:2.10.7
+    command: dagu start-all
+    restart: unless-stopped
+    expose:
+      - 8080
+    volumes:
+      - dagu-data:/var/lib/dagu
+    environment:
+      # Dagu binds to 127.0.0.1 by default; 0.0.0.0 is required to reach it
+      - DAGU_HOST=0.0.0.0
+      - DAGU_PORT=8080
+      - DAGU_AUTH_MODE=basic
+      - DAGU_AUTH_BASIC_USERNAME=${ADMIN_USERNAME}
+      - DAGU_AUTH_BASIC_PASSWORD=${ADMIN_PASSWORD}
+
+volumes:
+  dagu-data: {}

blueprints/dagu/meta.json

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+{
+  "id": "dagu",
+  "name": "Dagu",
+  "version": "2.10.7",
+  "description": "Dagu is a self-contained workflow engine with a Web UI. Schedule and orchestrate jobs as DAGs defined in declarative YAML, with no DBMS required.",
+  "logo": "logo.png",
+  "links": {
+    "github": "https://github.com/dagucloud/dagu",
+    "website": "https://dagu.sh",
+    "docs": "https://docs.dagu.sh"
+  },
+  "tags": [
+    "workflow",
+    "automation",
+    "scheduler",
+    "cron",
+    "devops"
+  ]
+}

blueprints/dagu/template.toml

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+[variables]
+main_domain = "${domain}"
+admin_password = "${password:32}"
+
+[config]
+mounts = []
+
+[[config.domains]]
+serviceName = "dagu"
+port = 8080
+host = "${main_domain}"
+
+[config.env]
+ADMIN_USERNAME = "admin"
+ADMIN_PASSWORD = "${admin_password}"