add custom TAL installer patch

deploy/docker-installer/compose/docker-compose.yml

@@ -11,8 +11,15 @@ services:
       RUN_ROOT: /var/lib/ours-rp
       BIN_DIR: /opt/ours-rp/bin
       FIXTURE_DIR: /opt/ours-rp/fixtures
+      CUSTOM_FIXTURE_DIR: /opt/ours-rp/custom-fixtures
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
     volumes:
       - ../.env:/opt/ours-rp/.env:ro
+      # Overlay the patched runner while keeping the original runtime image
+      # and its exact rpki binaries unchanged.
+      - ../scripts/soak/run_soak.sh:/opt/ours-rp/run_soak.sh:ro
+      - ${CUSTOM_FIXTURE_HOST_DIR:-../custom-fixtures}:/opt/ours-rp/custom-fixtures:ro
       - ${HOST_DATA_DIR:-/var/lib/ours-rp-package-installer}/state:/var/lib/ours-rp/state
       - ${HOST_DATA_DIR:-/var/lib/ours-rp-package-installer}/runs:/var/lib/ours-rp/runs
       - ${HOST_DATA_DIR:-/var/lib/ours-rp-package-installer}/logs:/var/lib/ours-rp/logs