Switch customer stack to Gitea + PostgreSQL two-service pattern

- web: Gitea (self-hosted Git), exposed via Traefik behind Authelia
- db: PostgreSQL 16, internal backend network only, never exposed
- Establishes the canonical web+db template structure for future products

Made-with: Cursor

docker/ss-atlas/templates/stack-template.yml

@@ -1,17 +1,21 @@
 # =============================================================================
-# CUSTOMER STACK TEMPLATE — Uptime Kuma
+# CUSTOMER STACK TEMPLATE — Gitea + PostgreSQL
 # =============================================================================
-# This is the Docker Swarm stack that gets deployed for each paying customer.
+# This is the Docker Swarm stack deployed for each paying customer.
 # It defines what product/service they receive when they subscribe.
 #
-# PRODUCT: Uptime Kuma — a self-hosted uptime/monitoring dashboard.
+# PRODUCT: Gitea — a self-hosted Git service, backed by PostgreSQL.
 # Each customer gets their own isolated instance at their subdomain.
 #
-# To sell a different product, replace the `web` service image and adjust
-# the port in the Traefik loadbalancer label accordingly.
+# Structure:
+#   web  — the application, exposed via Traefik behind Authelia auth
+#   db   — PostgreSQL, internal only (backend network, never exposed)
+#
+# To sell a different product: replace the `web` image, update the port
+# in the Traefik loadbalancer label, and adjust `db` env/image as needed.
 #
 # Template variables (injected at deploy time by swarm/client.go):
-#   {{.ID}}             - customer's username (used for unique resource naming)
+#   {{.ID}}             - customer's username (unique resource naming)
 #   {{.Subdomain}}      - customer's subdomain (same as ID by default)
 #   {{.Domain}}         - base domain (e.g. bc.a250.ca)
 #   {{.TraefikNetwork}} - Traefik overlay network name
@@ -21,11 +25,21 @@
 # =============================================================================
 services:
   web:
-    image: louislam/uptime-kuma:1
+    image: gitea/gitea:1-rootless
+    environment:
+      GITEA__database__DB_TYPE: postgres
+      GITEA__database__HOST: db:5432
+      GITEA__database__NAME: gitea
+      GITEA__database__USER: gitea
+      GITEA__database__PASSWD: gitea
+      GITEA__server__DOMAIN: "{{.Subdomain}}.{{.Domain}}"
+      GITEA__server__ROOT_URL: "https://{{.Subdomain}}.{{.Domain}}"
+      GITEA__server__HTTP_PORT: "3000"
     volumes:
-      - uptime_data:/app/data
+      - gitea_data:/var/lib/gitea
     networks:
       - traefik_net
+      - backend
     deploy:
       replicas: 1
       labels:
@@ -35,7 +49,22 @@ services:
         traefik.http.routers.customer-{{.ID}}-web.entrypoints: "websecure"
         traefik.http.routers.customer-{{.ID}}-web.tls: "true"
         traefik.http.routers.customer-{{.ID}}-web.middlewares: "authelia-auth@swarm"
-        traefik.http.services.customer-{{.ID}}-web.loadbalancer.server.port: "3001"
+        traefik.http.services.customer-{{.ID}}-web.loadbalancer.server.port: "3000"
+      restart_policy:
+        condition: on-failure
+
+  db:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_DB: gitea
+      POSTGRES_USER: gitea
+      POSTGRES_PASSWORD: gitea
+    volumes:
+      - db_data:/var/lib/postgresql/data
+    networks:
+      - backend
+    deploy:
+      replicas: 1
       restart_policy:
         condition: on-failure
 
@@ -43,7 +72,11 @@ networks:
   traefik_net:
     external: true
     name: "atlas_{{.TraefikNetwork}}"
+  backend:
+    driver: overlay
 
 volumes:
-  uptime_data:
+  gitea_data:
+    driver: local
+  db_data:
     driver: local