Downgrade to python 3.9

[AlbertoPimpo]

After the automatic upgrade to python 3.10 dockerfile doesn't compile properly. It is because the following line in dockerfile that still refers to python 3.9:
RUN cp /usr/local/lib/python3.9/site-packages/bootstrap_italia_template/templates/bootstrap-italia-base.html templates/base-setup.html

If i change it to python 3.10 it still doesn't compile returning the following error:
`=> ERROR [16/18] RUN python manage.py migrate 0.9s

[16/18] RUN python manage.py migrate:
#21 0.884 Traceback (most recent call last):
#21 0.885 File "", line 241, in _call_with_frames_removed
#21 0.885 File "/uniTicket/uni_ticket_project/settings.py", line 24, in
#21 0.885 from . settingslocal import *
#21 0.885 File "/uniTicket/uni_ticket_project/settingslocal.py", line 330, in
#21 0.885 ADDITIONAL_USER_FIELDS = [uni_ticket_settings.EMPLOYEE_ATTRIBUTE_NAME,
#21 0.885 NameError: name 'uni_ticket_settings' is not defined

failed to solve: rpc error: code = Unknown desc = executor failed running [/bin/sh -c python manage.py migrate]: exit code: 1`

If I downgrade the version of python to 3.9 (as in the commit of PR) it works properly.

[peppelinux]

Hi @francesco-filicetti @AlbertoPimpo

I think that we must haev the docker build as a test in CI, do you agree?

name: Docker Image CI

on: [push]

jobs:

  build:

    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
    - name: Build the docker-compose stack
      run: docker-compose up -d
    - name: Check running containers
      run: docker ps -a
    - name: Stop docker compose
      run: docker-compose stop

[AlbertoPimpo]

I think it should be also necessary that the docker-compose.yaml actually build the image instead of downloading it like

uniticket:
build:
context: .
dockerfile: Dockerfile
container_name: uniticket
restart: always

otherwise the test will always be verified. I can do a PR for discussing it if you want.

[codecov-commenter]

Codecov Report

Merging #73 (64150a1) into master (a4bb0d6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #73   +/-   ##
=======================================
  Coverage   80.64%   80.64%           
=======================================
  Files          13       13           
  Lines        4175     4175           
=======================================
  Hits         3367     3367           
  Misses        808      808           

Flag	Coverage Δ
unittests	80.64% <ø> (ø)

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[peppelinux]

in v2.0.0 branch I enabled also python 3.10
everything seems to work fine, even the docker image build and run

https://github.com/UniversitaDellaCalabria/uniTicket/blob/v2.0.0/.github/workflows/python-app.yml

May we close this PR or is there something more to discuss to consider this issues still valid to be merged?

[AlbertoPimpo]

If Python 3.10 now works, there's no need to downgrade