ci(forgejo): robust BRouter segment seed + longer routing warmup (e2e)

- verify the segment download is non-empty (retry x3); brouter.de is flaky
  and a silent empty download surfaced only as a 240s routing timeout.
- bump routing readiness wait 120s->240s (segment load on a busy runner).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.forgejo/workflows/ci.yml

@@ -214,10 +214,19 @@ jobs:
         # container — a job-side download + bind mount would not be visible to
         # the DinD daemon (separate filesystem). Project name pinned to `trails`
         # so the volume matches docker-compose.dev.yml's `brouter_segments`.
+        # Verify the download is non-empty (brouter.de can be flaky) so a bad
+        # segment fails here rather than as a mysterious routing timeout later.
         run: |
           docker volume create trails_brouter_segments
-          docker run --rm -v trails_brouter_segments:/dst alpine sh -c \
-            "wget -q https://brouter.de/brouter/segments4/E10_N50.rd5 -O /dst/E10_N50.rd5 && chmod a+r /dst/*.rd5"
+          docker run --rm -v trails_brouter_segments:/dst alpine sh -c '
+            set -e
+            for a in 1 2 3; do
+              wget -q https://brouter.de/brouter/segments4/E10_N50.rd5 -O /dst/E10_N50.rd5 && break
+              echo "segment download attempt $a failed; retrying"; sleep 5
+            done
+            test -s /dst/E10_N50.rd5
+            chmod a+r /dst/*.rd5
+            ls -la /dst'
 
       - name: Start services
         run: docker compose -p trails -f docker-compose.dev.yml up -d --wait --build postgres brouter
@@ -226,9 +235,9 @@ jobs:
 
       - name: Wait for BRouter routing
         run: |
-          for i in $(seq 1 60); do
+          for i in $(seq 1 120); do
             curl -s 'http://host.docker.internal:17777/brouter?lonlats=13.4,52.5|13.5,52.5&profile=trekking&format=geojson' 2>/dev/null | grep -q "FeatureCollection" && echo "BRouter ready" && break
-            [ "$i" = "60" ] && echo "BRouter not ready after 120s" && exit 1
+            [ "$i" = "120" ] && echo "BRouter not ready after 240s" && exit 1
             sleep 2
           done