Reorder Dockerfile

Dockerfile

@@ -6,13 +6,14 @@ WORKDIR /image_drop
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1
 
-# Copy app code
-COPY . /image_drop
-
 # Install Python deps
+COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt \
     && pip install --no-cache-dir python-multipart
 
+# Copy app code
+COPY . /image_drop
+
 
 # Data dir for SQLite (state.db)
 #RUN mkdir -p /data