Add Traefik basic auth middleware for mtls-bridge

monitoring/mtls-bridge/README.md

@@ -16,6 +16,7 @@ Internal HTTP-to-mTLS bridge for services that cannot present client certificate
 - `CA_CERT` (default `/certs/ca.crt`): CA certificate bundle used to verify upstream TLS.
 - `TIMEOUT` (default `5`): request timeout in seconds.
 - `LOG_LEVEL` (default `INFO`): Python logging level.
+- `MTLS_BRIDGE_BASIC_AUTH_USERS` (required for Traefik auth): value for `traefik.http.middlewares.*.basicauth.users` (e.g. `user:$$apr1$$...`).
 
 ## Endpoints