Fix face_recognition install on HF

Dockerfile

@@ -14,10 +14,13 @@ RUN apt-get update && apt-get install -y \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
-COPY . /app
+COPY requirements.txt /app/requirements.txt
+
+RUN pip install --upgrade pip setuptools wheel \
+    && pip install --no-cache-dir -r requirements.txt \
+    && python -c "import face_recognition; print('face_recognition ok')"
 
-RUN pip install --upgrade pip \
-    && pip install --no-cache-dir -r requirements.txt
+COPY . /app
 
 ENV PORT=7860