feat(GoatCounter): Add GoatCounter template

blueprints/goatcounter/docker-compose.yml

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+services:
+  postgres:
+    image: postgres:18-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: goatcounter
+      POSTGRES_PASSWORD: ${DB_PASSWORD:?DB_PASSWORD is required}
+      POSTGRES_DB: goatcounter
+    volumes:
+      - postgres_data:/var/lib/postgresql
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U goatcounter -d goatcounter"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  goatcounter:
+    image: arp242/goatcounter:2.7
+    restart: unless-stopped
+    depends_on:
+      postgres:
+        condition: service_healthy
+    expose:
+      - "8080"
+    environment:
+      GOATCOUNTER_DB: "postgresql+postgresql://goatcounter:${DB_PASSWORD:?DB_PASSWORD is required}@postgres:5432/goatcounter?sslmode=disable"
+      GOATCOUNTER_LISTEN: "0.0.0.0:8080"
+    command:
+      - serve
+      - -automigrate
+
+volumes:
+  postgres_data:

blueprints/goatcounter/meta.json

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+{
+  "id": "goatcounter",
+  "name": "GoatCounter",
+  "version": "2.7.0",
+  "description": "GoatCounter is an open source web analytics platform available as a free donation-supported hosted service or self-hosted app. It aims to offer easy to use and meaningful privacy-friendly web analytics as an alternative to Google Analytics or Matomo.",
+  "logo": "logo.svg",
+  "links": {
+    "website": "https://www.goatcounter.com/",
+    "github": "https://github.com/arp242/goatcounter",
+    "docs": "https://www.goatcounter.com/help/"
+  },
+  "tags": ["analytics", "privacy"]
+}

blueprints/goatcounter/template.toml

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+[variables]
+db_password = "${password:32}"
+goatcounter_domain = "${domain}"
+
+[config]
+env = ["DB_PASSWORD=${db_password}"]
+
+[[config.domains]]
+serviceName = "goatcounter"
+port = 8080
+host = "${goatcounter_domain}"
+https = true