dev-deploy: restore GeoIP bind-mount, drop image bake

With the runner in host-mode, compose bind-mount paths resolve to
real host paths the Docker daemon can see, so the GeoIP file no
longer needs to be baked into the backend image to survive CI. Bring
back the bind-mount of `pkg/geoip/test-data/.../mmdb`, matching how
local-dev sources it. Image now only carries the backend binary,
symmetric with the production `backend/Dockerfile`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tools/dev-deploy/docker-compose.yml

@@ -125,11 +125,7 @@ services:
         target: ${GALAXY_DEV_GAME_STATE_DIR}
         bind:
           create_host_path: true
-      # The GeoIP database is baked into the backend image (see
-      # tools/local-dev/backend.Dockerfile); a bind-mount is not used
-      # here because the source path resolves inside the runner
-      # workspace volume and the host Docker daemon cannot see it,
-      # which produced an "is a directory" error in CI.
+      - ../../pkg/geoip/test-data/test-data/GeoIP2-Country-Test.mmdb:/var/lib/galaxy/geoip.mmdb:ro
     networks:
       - galaxy-internal
     healthcheck: