fix(ci): smoke-test the image over its bridge IP, not a published host port

Self-hosted runners can execute job steps as a sibling container sharing
the host's Docker socket, so -p 18080:8080 publishes on the runner host
rather than inside the step's own container — 127.0.0.1 never reaches it
(curl exit 7). Container-to-container traffic over the bridge network
always works, so resolve the smoke container's own IP and probe that.

.gitea/workflows/docker.yml

@@ -74,25 +74,33 @@ jobs:
           echo "container uid: $uid"
           [ "$uid" = "1000" ] || { echo "::error::image runs as uid $uid, expected 1000"; exit 1; }
 
-          # 2. Boot the server and probe it over HTTP.
+          # 2. Boot the server and probe it over HTTP. Talk to the container's own
+          # bridge IP rather than a host-published port (-p): self-hosted runners
+          # commonly execute steps as a sibling container sharing the host's
+          # Docker socket, in which case -p publishes on the *runner host*, not
+          # inside this step's container, and 127.0.0.1 never reaches it.
+          # Container-to-container traffic over the bridge network always works.
           docker run -d --name familiar-smoke -e FAMILIAR_HTTP_TOKEN="$TOKEN" -p 18080:8080 "$IMG"
+          ip=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' familiar-smoke)
+          BASE="http://${ip}:8080"
+
           for i in $(seq 1 30); do
-            if curl -fsS "http://127.0.0.1:18080/healthz" >/dev/null 2>&1; then break; fi
+            if curl -fsS "$BASE/healthz" >/dev/null 2>&1; then break; fi
             sleep 1
           done
 
           echo "== /healthz (expect 200) =="
-          code=$(curl -s -o /dev/null -w '%{http_code}' "http://127.0.0.1:18080/healthz")
+          code=$(curl -s -o /dev/null -w '%{http_code}' "$BASE/healthz")
           [ "$code" = "200" ] || { echo "::error::/healthz returned $code"; docker logs familiar-smoke; exit 1; }
 
           echo "== MCP without token (expect 401) =="
-          code=$(curl -s -o /dev/null -w '%{http_code}' -X POST "http://127.0.0.1:18080/mcp" \
+          code=$(curl -s -o /dev/null -w '%{http_code}' -X POST "$BASE/mcp" \
             -H 'Accept: application/json, text/event-stream' -H 'Content-Type: application/json' \
             -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}')
           [ "$code" = "401" ] || { echo "::error::unauthenticated MCP returned $code"; exit 1; }
 
           echo "== MCP with valid token (expect 200) =="
-          code=$(curl -s -o /dev/null -w '%{http_code}' -X POST "http://127.0.0.1:18080/mcp" \
+          code=$(curl -s -o /dev/null -w '%{http_code}' -X POST "$BASE/mcp" \
             -H "Authorization: Bearer $TOKEN" \
             -H 'Accept: application/json, text/event-stream' -H 'Content-Type: application/json' \
             -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"ci","version":"1"}}}')