[BUG] pip not installed so docker image incomplete

[banksonian]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

logs show a persistent error looking for the Flask package and web site is inaccessible (not running)

Instance fixed by:
docker exec -it calibre-web /bin/bash

apt install python3-pip
rerunning the dockerfile's RUN commands

Expected Behavior

web site is acccessible

Steps To Reproduce

fresh docker compose

Environment

pulled using docker compose

CPU architecture

x86-64

Docker creation

image pulled using docker compose

Container logs

...
calibre-web  | ModuleNotFoundError: No module named 'flask'
calibre-web  | Traceback (most recent call last):
calibre-web  |   File "/app/calibre-web/cps.py", line 28, in <module>
calibre-web  |     from cps.main import main
calibre-web  |   File "/app/calibre-web/cps/__init__.py", line 28, in <module>
calibre-web  |     from flask import Flask
calibre-web  | ModuleNotFoundError: No module named 'flask'
calibre-web  | Traceback (most recent call last):
calibre-web  |   File "/app/calibre-web/cps.py", line 28, in <module>
calibre-web  |     from cps.main import main
calibre-web  |   File "/app/calibre-web/cps/__init__.py", line 28, in <module>
calibre-web  |     from flask import Flask
calibre-web  | ModuleNotFoundError: No module named 'flask'
calibre-web  | Traceback (most recent call last):
calibre-web  |   File "/app/calibre-web/cps.py", line 28, in <module>
calibre-web  |     from cps.main import main
calibre-web  |   File "/app/calibre-web/cps/__init__.py", line 28, in <module>
calibre-web  |     from flask import Flask
...

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