Restructure docker into layered compose files, add a Makefile

Move compose.yml/compose.override.yml/compose.traefik.yml into docker/ and
split into the explicit prod -> dev -> local layering; compose.override.yml
had to be renamed because docker compose auto-loads that filename, which
defeats the layering.

- external network traefik-public -> proxy (shared with the website stack)
- frontend host dashboard.${DOMAIN} -> app.${DOMAIN}
- stable container_names, security_opt no-new-privileges on prod services
- adminer bound to 127.0.0.1 in dev instead of all interfaces
- .env.example replaces the committed .env
- pre-commit biome hook ran npm in a bun repo

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docker/compose.traefik.yml

@@ -0,0 +1,77 @@
+services:
+  traefik:
+    image: traefik:3.6
+    ports:
+      # Listen on port 80, default for HTTP, necessary to redirect to HTTPS
+      - 80:80
+      # Listen on port 443, default for HTTPS
+      - 443:443
+    restart: always
+    labels:
+      # Enable Traefik for this service, to make it available in the public network
+      - traefik.enable=true
+      # Use the proxy network (declared below)
+      - traefik.docker.network=proxy
+      # Define the port inside of the Docker service to use
+      - traefik.http.services.traefik-dashboard.loadbalancer.server.port=8080
+      # Make Traefik use this domain (from an environment variable) in HTTP
+      - traefik.http.routers.traefik-dashboard-http.entrypoints=http
+      - traefik.http.routers.traefik-dashboard-http.rule=Host(`traefik.${DOMAIN?Variable not set}`)
+      # traefik-https the actual router using HTTPS
+      - traefik.http.routers.traefik-dashboard-https.entrypoints=https
+      - traefik.http.routers.traefik-dashboard-https.rule=Host(`traefik.${DOMAIN?Variable not set}`)
+      - traefik.http.routers.traefik-dashboard-https.tls=true
+      # Use the "le" (Let's Encrypt) resolver created below
+      - traefik.http.routers.traefik-dashboard-https.tls.certresolver=le
+      # Use the special Traefik service api@internal with the web UI/Dashboard
+      - traefik.http.routers.traefik-dashboard-https.service=api@internal
+      # https-redirect middleware to redirect HTTP to HTTPS
+      - traefik.http.middlewares.https-redirect.redirectscheme.scheme=https
+      - traefik.http.middlewares.https-redirect.redirectscheme.permanent=true
+      # traefik-http set up only to use the middleware to redirect to https
+      - traefik.http.routers.traefik-dashboard-http.middlewares=https-redirect
+      # admin-auth middleware with HTTP Basic auth
+      # Using the environment variables USERNAME and HASHED_PASSWORD
+      - traefik.http.middlewares.admin-auth.basicauth.users=${USERNAME?Variable not set}:${HASHED_PASSWORD?Variable not set}
+      # Enable HTTP Basic auth, using the middleware created above
+      - traefik.http.routers.traefik-dashboard-https.middlewares=admin-auth
+    volumes:
+      # Add Docker as a mounted volume, so that Traefik can read the labels of other services
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+      # Mount the volume to store the certificates
+      - traefik-certificates:/certificates
+    command:
+      # Enable Docker in Traefik, so that it reads labels from Docker services
+      - --providers.docker
+      # Do not expose all Docker services, only the ones explicitly exposed
+      - --providers.docker.exposedbydefault=false
+      # Create an entrypoint "http" listening on port 80
+      - --entrypoints.http.address=:80
+      # Create an entrypoint "https" listening on port 443
+      - --entrypoints.https.address=:443
+      # Create the certificate resolver "le" for Let's Encrypt, uses the environment variable EMAIL
+      - --certificatesresolvers.le.acme.email=${EMAIL?Variable not set}
+      # Store the Let's Encrypt certificates in the mounted volume
+      - --certificatesresolvers.le.acme.storage=/certificates/acme.json
+      # Use the TLS Challenge for Let's Encrypt
+      - --certificatesresolvers.le.acme.tlschallenge=true
+      # Enable the access log, with HTTP requests
+      - --accesslog
+      # Enable the Traefik log, for configurations and errors
+      - --log
+      # Enable the Dashboard and API
+      - --api
+    networks:
+      # Use the public network created to be shared between Traefik and
+      # any other service that needs to be publicly available with HTTPS
+      - proxy
+
+volumes:
+  # Create a volume to store the certificates, even if the container is recreated
+  traefik-certificates:
+
+networks:
+  # Use the previously created public network "proxy", shared with other
+  # services that need to be publicly available via this Traefik
+  proxy:
+    external: true