Missing pip leads to failure in building Docker image

[r1235613]

I encountered the following error message when building a Docker image.
By adding py3-pip, I was able to resolve this issue.
My system is a KVM virtual machine running on Proxmox, with Ubuntu 22.04.2 LTS as the operating system.

root@htmdocker:~/htm.docker/htm.core# docker build --build-arg arch=amd64  .
[+] Building 10.7s (11/18)                                                                                                                         
 => [internal] load .dockerignore                                                                                                             0.0s
 => => transferring context: 2B                                                                                                               0.0s
 => [internal] load build definition from Dockerfile                                                                                          0.0s
 => => transferring dockerfile: 2.48kB                                                                                                        0.0s
 => [internal] load metadata for docker.io/multiarch/alpine:amd64-latest-stable                                                               0.7s
 => [build  1/14] FROM docker.io/multiarch/alpine:amd64-latest-stable@sha256:46847607e30096a3f365d9944dddccf60f1b9bf3fb1383694c25a470345f524  0.0s
 => [internal] load build context                                                                                                             0.0s
 => => transferring context: 884.14kB                                                                                                         0.0s
 => CACHED [build  2/14] RUN echo "Building HTM foramd64" && uname -a                                                                         0.0s
 => CACHED [build  3/14] RUN apk add --update      cmake     make     g++     git     python3-dev     py3-numpy                               0.0s
 => [build  4/14] ADD . /usr/local/src/htm.core                                                                                               4.3s
 => [build  5/14] WORKDIR /usr/local/src/htm.core                                                                                             5.0s
 => [build  6/14] RUN ln -s /usr/bin/python3 /usr/local/bin/python && python --version                                                        0.3s
 => ERROR [build  7/14] RUN python -m pip install --upgrade setuptools pip wheel                                                              0.4s
------
 > [build  7/14] RUN python -m pip install --upgrade setuptools pip wheel:
#0 0.387 /usr/local/bin/python: No module named pip
------
Dockerfile:45
--------------------
  43 |     RUN ln -s /usr/bin/python3 /usr/local/bin/python && python --version 
  44 |     
  45 | >>> RUN python -m pip install --upgrade setuptools pip wheel
  46 |     
  47 |     # Install
--------------------
ERROR: failed to solve: process "/bin/sh -c python -m pip install --upgrade setuptools pip wheel" did not complete successfully: exit code: 1

[dkeeney]

I don't know much about docker but I don't see where it builds htm.core from sources.
The pip install of htm.core is not supported because we don't do the builds for PyPl any more.

[r1235613]

Many instructions within the Dockerfile make use of pip. If py3-pip is not added, the aforementioned error will occur. This might be due to updates in the base image, necessitating additional installation.

htm.core/Dockerfile

Line 45 in ef419b2

RUN python -m pip install --upgrade setuptools pip wheel

[dkeeney]

I don't see any problem with doing this. However, I know nothing about Docker so I don't feel qualified to judge if this is the correct way to fix the problem.

I am requesting @ctrl-z-9000-times or @breznak to take a look.