What is the right way for running multiple commands in one `action`?

## For example:

I want to run a python script as `action`. Before running this script I need to install the `requirements.txt`.

### I can think of several options:

 - Create a `Dockerfile` with the command `RUN pip install -r requirements.txt` in it.
 - Use the `python:3` image, and run the `pip install -r requirements.txt` in the `entrypoint.sh` file before running the arguments from `args` in `main.workflow`.
 - use both `pip install` and `python myscript.py` as `args`

## Another example:

I want to run a script that exists in my repository, then compare 2 files (its output and a file that already exists).

This is a process that includes **two commands**, whereas in the first example, the `pip install` command can be considered **a building command** rather than a test command.

## the question:

Can I create another Docker for another command, which will contain the output of the previous Docker?

I&#39;m looking for guidelines for the location of the command in `Dockerfile`, in `entrypoint` or in `args`.

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How to run multiple commands in one Github Actions Docker