feat(docker): containerise the setup

.env.docker.example

@@ -0,0 +1,12 @@
+# Le Tribunal — Docker deployment with managed Supabase
+
+# --- Domain ---
+APP_DOMAIN=acropole.alxczl.fr
+
+# --- Traefik ---
+TRAEFIK_NETWORK=proxy
+
+# --- Supabase (managed) ---
+# From your Supabase project: Settings -> API
+SUPABASE_URL=
+SUPABASE_ANON_KEY=