Added ARM to docker image

[ZuluPro]

Added ARM build for Docker images.

Issue: #26

[EpicWink]

As I say in the issue, I need a way to test the ARM image before I release it. Either include an automated test for the image, or include (a link to) instructions on how I can emulate ARM locally

Also, I think this is a duplicate of #24

[ZuluPro]

Hi @EpicWink I added the ARM archs to the matrix

[EpicWink]

I mean image integration test (make sure the server runs, and pip can install a package), not image creation. ~There's currently no testing of the x86 image yet~ I just added integration tests

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (61168e6) 88.63% compared to head (93bee24) 88.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #27   +/-   ##
=======================================
  Coverage   88.63%   88.63%           
=======================================
  Files           3        3           
  Lines         651      651           
=======================================
  Hits          577      577           
  Misses         74       74           

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.

[EpicWink]

I can't get CI to work: https://github.com/EpicWink/proxpi/actions/runs/5180236563

[EpicWink]

Does #45 meet your needs?