feat: add Seq template (#942)

Co-authored-by: Rohit Mulani <289630555+rohitmulani63-ops@users.noreply.github.com>
Co-authored-by: Mauricio Siu <siumauricio@icloud.com>

blueprints/seq/README.md

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+# Seq
+
+Seq is a self-hosted log search and structured observability server from Datalust.
+
+This Dokploy template includes:
+
+- Seq server using the official Datalust container image
+- Generated first-run admin password
+- Canonical URL configured from the Dokploy domain
+- Persistent `/data` volume
+- Dokploy domain routing for the web UI and ingestion API on port 80
+
+The template sets `ACCEPT_EULA=Y`, which is required by the official Seq container image.

blueprints/seq/docker-compose.yml

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+version: "3.8"
+
+services:
+  seq:
+    image: datalust/seq:2025.2
+    restart: unless-stopped
+    environment:
+      ACCEPT_EULA: "Y"
+      SEQ_API_CANONICALURI: ${SEQ_API_CANONICALURI}
+      SEQ_FIRSTRUN_ADMINPASSWORD: ${SEQ_FIRSTRUN_ADMINPASSWORD}
+    expose:
+      - "80"
+    volumes:
+      - seq-data:/data
+
+volumes:
+  seq-data: {}

blueprints/seq/logo.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128" role="img" aria-label="Seq">
+  <rect width="128" height="128" rx="24" fill="#1f2937"/>
+  <path d="M30 39h68v12H30zM30 58h50v12H30zM30 77h68v12H30z" fill="#fbbf24"/>
+  <circle cx="98" cy="64" r="12" fill="#38bdf8"/>
+</svg>

blueprints/seq/template.toml

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+[variables]
+main_domain = "${domain}"
+admin_password = "${password:32}"
+
+[config]
+env = [
+  "ACCEPT_EULA=Y",
+  "SEQ_API_CANONICALURI=https://${main_domain}",
+  "SEQ_FIRSTRUN_ADMINPASSWORD=${admin_password}"
+]
+mounts = []
+
+[[config.domains]]
+serviceName = "seq"
+port = 80
+host = "${main_domain}"