Solved other port mapping issues

Dockerfile

@@ -11,5 +11,4 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Copy application code
 COPY app/ .
 
-# Start command using shell to allow env substitution
+CMD ["python", "app.py"]
-CMD sh -c "exec python app.py --port=\${PORT}"

main.py

@@ -125,7 +125,7 @@ def run_prod(args):
     """
     command = [
         "docker", "run", "-d",
-        "-p", "{PORT}:{PORT}",
+        "-p", "{PORT}:5000",
         "--name", "portfolio",
         "application-portfolio"
     ]