build(compose): add Valkey service to the dev docker-compose (#257)

The server's single-use ticket store reads via GETDEL on a Redis-compatible
instance; until now only the prod compose had one. Mirrors prod (valkey 9.0,
appendonly, ping healthcheck); port 6379 exposed so a locally-run server can
connect through REDIS_URI=redis://localhost:6379.

docker-compose.yaml

@@ -19,5 +19,21 @@ services:
       timeout: 5s
       retries: 5
 
+  valkey:
+    image: valkey/valkey:9.0-alpine
+    container_name: evolution-valkey
+    ports:
+      - "6379:6379"
+    volumes:
+      - valkey_data:/data
+    restart: unless-stopped
+    healthcheck:
+      test: [ "CMD", "valkey-cli", "ping" ]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    command: valkey-server --appendonly yes
+
 volumes:
   postgres_data:
+  valkey_data: