add basic auth example

examples/traefik/README.md

@@ -2,7 +2,7 @@
 
 Assumptions:
 
-- Traefik 2 installed.
+- Traefik 2/3 installed.
 - External proxy docker network `proxy`.
 - A certificate resolver `le`.
 - A https entrypoint `secure`.
@@ -34,3 +34,43 @@ services:
       - traefik.http.routers.cryptgeon.entrypoints=secure
       - traefik.http.routers.cryptgeon.tls.certresolver=le
 ```
+
+## With basic auth
+
+Some times it's useful to hide the service behind auth. This is easily achieved with traefik middleware. Many reverse proxies support similar features, so while traefik is used in this example, other reverse proxies can do the same.
+
+```yaml
+services:
+  traefik:
+    image: traefik:v3.0
+    command:
+      - "--api.insecure=true"
+      - "--providers.docker=true"
+      - "--providers.docker.exposedbydefault=false"
+      - "--entrypoints.web.address=:80"
+    ports:
+      - "80:80"
+    volumes:
+      - "/var/run/docker.sock:/var/run/docker.sock:ro"
+
+  redis:
+    image: redis:7-alpine
+
+  cryptgeon:
+    image: cupcakearmy/cryptgeon
+    depends_on:
+      - redis
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.cryptgeon.rule=Host(`cryptgeon.localhost`)"
+      - "traefik.http.routers.cryptgeon.entrypoints=web"
+      - "traefik.http.routers.cryptgeon.middlewares=cryptgeon-auth"
+      - "traefik.http.middlewares.cryptgeon-auth.basicauth.users=user:$$2y$$05$$juUw0zgc5ebvJ00MFPVVLujF6P.rcEMbGZ99Jfq6ZWEa1dgetacEq"
+```
+
+```bash
+docker compose up -d
+```
+
+1. Open http://cryptgeon.localhost
+2. Log in with user and secret