ci: docker integration test fixes

Author: evansims

docker/ledger-integration-tests/docker-compose.yml

@@ -27,8 +27,8 @@ services:
       INFERADB__LEDGER__METRICS_ADDR: "0.0.0.0:9090"
       INFERADB__LEDGER__DATA_DIR: "/var/lib/ledger"
       RUST_LOG: "info,inferadb_ledger_server=debug"
-    volumes:
-      - ledger-data:/var/lib/ledger
+    tmpfs:
+      - /var/lib/ledger:uid=65532,gid=65532
     healthcheck:
       test: ["CMD-SHELL", "nc -z localhost 50051 || exit 1"]
       interval: 2s
@@ -83,8 +83,6 @@ networks:
     name: inferadb-control-ledger-test-net
 
 volumes:
-  ledger-data:
-    name: inferadb-control-ledger-data
   cargo-registry:
     name: inferadb-control-ledger-cargo-registry
   cargo-git: