Install file for Docker static Qt verification

ober

50505e06e13ee599d03671094589deaf2794d863

diff --git a/Dockerfile.qt b/Dockerfile.qt
index 9d41bc5..37eb3b5 100644
--- a/Dockerfile.qt
+++ b/Dockerfile.qt
@@ -24,7 +24,7 @@ ARG TS_VERSION=0.24.7
 
 # ── Phase 1: Alpine build deps ──────────────────────────────────────────
 RUN apk add --no-cache \
-    cmake samurai perl python3 linux-headers patchelf \
+    cmake samurai perl python3 linux-headers patchelf file \
     libxcb-dev xcb-util-dev xcb-util-image-dev \
     xcb-util-keysyms-dev xcb-util-renderutil-dev \
     xcb-util-wm-dev xcb-util-cursor-dev \