Pre-seed BRouter volume in CI instead of bind mount override

The bind mount override (docker-compose.ci.yml) failed because file
permissions on the cached segment prevented the entrypoint from seeing
the file, causing a fresh download on every CI run.

Instead: create the named volume and copy the cached segment into it
before compose starts, using alpine with explicit chmod. The entrypoint
then finds the segment and skips the download, so BRouter starts in ~4s
instead of ~2min.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -204,8 +204,16 @@ jobs:
           mkdir -p /tmp/brouter-segments
           wget -q "https://brouter.de/brouter/segments4/E10_N50.rd5" -O /tmp/brouter-segments/E10_N50.rd5
 
+      - name: Pre-seed BRouter segment volume
+        run: |
+          docker volume create trails_brouter_segments
+          docker run --rm \
+            -v /tmp/brouter-segments:/src:ro \
+            -v trails_brouter_segments:/dst \
+            alpine sh -c "cp /src/*.rd5 /dst/ && chmod a+r /dst/*.rd5"
+
       - name: Start services
-        run: docker compose -f docker-compose.dev.yml -f docker-compose.ci.yml up -d --wait --build
+        run: docker compose -f docker-compose.dev.yml up -d --wait --build
         env:
           BROUTER_URL: http://localhost:17777
 

docker-compose.ci.yml

@@ -1,4 +0,0 @@
-services:
-  brouter:
-    volumes:
-      - /tmp/brouter-segments:/data/segments