diff --git a/.gitignore b/.gitignore
index 0680b87..8a1a6e1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -57,6 +57,7 @@ Thumbs.db
 /var/lib/gps-denied/
 fdr_output/
 tile_cache/
+e2e-results/
 
 # Secrets
 .env
diff --git a/e2e/docker/docker-compose.test.yml b/e2e/docker/docker-compose.test.yml
index ba184d9..c499021 100644
--- a/e2e/docker/docker-compose.test.yml
+++ b/e2e/docker/docker-compose.test.yml
@@ -16,7 +16,7 @@ services:
   gps-denied-onboard:
     build:
       context: ../..
-      dockerfile: docker/Dockerfile
+      dockerfile: docker/companion-tier1.Dockerfile
       args:
         BUILD_VINS_MONO: "OFF"
     image: gps-denied-onboard:e2e
@@ -126,14 +126,12 @@ networks:
 volumes:
   # Size cap follows AC-NEW-3: each FDR file ≤ 64 GB. The volume layer cap is
   # belt-and-suspenders; the SUT enforces the cap internally per NFT-LIM-02.
-  # `--storage-opt size=64g` requires overlay2 with xfs backing on the host; CI
-  # YAML notes the fallback for CI runners that lack that driver combination.
-  fdr-output:
-    driver: local
-    driver_opts:
-      type: tmpfs
-      device: tmpfs
-      o: "size=64g"
+  # `--storage-opt size=64g` requires overlay2 with xfs backing on the host —
+  # most CI runners and macOS Docker Desktop hosts lack that combination, so
+  # this base file uses the documented fallback (a plain named volume) and
+  # relies on the SUT-internal cap. CI runners with overlay2+xfs can override
+  # via a docker-compose.override.yml that re-introduces the tmpfs driver_opts.
+  fdr-output: {}
   tile-cache-fixture: {}
   tlog-output: {}
   mock-audit: {}