fix bad ordering in Dockerfile

Author: ysawa0

templates/Dockerfile

@@ -1,12 +1,11 @@
 FROM python:3.10-slim
 
-# Set the working directory in the container to /app
+# Create and set the working directory
 WORKDIR /app
 
-# Copy the current directory contents into the container at /app
-COPY . .
-
-# Install any needed packages specified in requirements.txt
+COPY requirements.txt ./
 RUN pip install --no-cache-dir -r requirements.txt
 
+COPY . .
+
 CMD ["python", "./main.py"]