tensorflow docker compose中没有apt?

我需要使用tensorflow的旧版本来编译项目。为此,我们设置docker compose文件:

version: "3.8"

services:
  exercise:
    build:
      context: .
    container_name: practical_4
    environment:
      DATASET: cifar
    volumes:
      - "./:/app/"

    command: bash run.sh

我的Dockerfile如下所示:

FROM tensorflow/tensorflow:1.15.2

WORKDIR /app
COPY . /app/

RUN ['apt', 'install', 'python-pip']
#RUN ['pip', 'install', 'matplotlib']

最后是运行脚本:

#!/bin/bash

echo "$DATASET"

# Install dependencies
pip install matplotlib
pip install numpy
pip install pickle

if [ $DATASET = "cifar" ]; then
  python cifar_cnn.py
else
  python mnist_cnn.py
fi

现在,跑步时 docker-compose up 程序失败。对于某些情况,未找到命令apt。。?

Step 4/5 : RUN ['apt', 'install', 'python-pip']
 ---> Running in 39c9c48240b5
/bin/sh: 1: [apt,: not found
ERROR: Service 'exercise' failed to build: The command '/bin/sh -c ['apt', 'install', 'python-pip']' returned a non-zero code: 127

为什么会这样,我该如何解决这个问题?