Update server config, builder APK logic, frontend fleet/activity metrics, and ignore test APKs

server/internal/builder/build_apk.go

@@ -231,6 +231,9 @@ func apkFileName(req *BuildRequest) string {
 
 // buildAPKAgent compiles a linux/arm64 agent, embeds it in the Android project, and packages an APK.
 func (h *Handler) buildAPKAgent(ctx context.Context, req *BuildRequest) (BuildResponse, int, string) {
+	h.apkBuildMu.Lock()
+	defer h.apkBuildMu.Unlock()
+
 	if req.ScoutMode {
 		ApplyApkScoutPreset(req)
 	} else {
@@ -337,6 +340,7 @@ func (h *Handler) buildAPKAgent(ctx context.Context, req *BuildRequest) (BuildRe
 	}
 	h.setProgress(req.CancelToken, "Saving to database", 99)
 	if err := h.db.InsertBuild(buildRecord); err != nil {
+		cleanupBuild()
 		return BuildResponse{Success: false, Error: "Failed to record build in database"}, http.StatusInternalServerError, ""
 	}