ci: add nightly CRON job for Tiobe TICS.

[aznashwan]

Overview

This patch adds:

• the necessary tox env targets for generating Cobertura coverage report XML format
• a GitHub Workflow which runs the unit tests with coverage enabled, and calls the TICSServer to upload the analysis results

Rationale

Workflow will allow for daily automatic code quality report uploads to Tiobe after the project is onboarded on their end and we receive our TICSAUTHTOKEN for the workflow.

Juju Events Changes

None.

Module Changes

None.

Library Changes

None.

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated
• The PR is tagged with appropriate label (urgent, trivial, complex)

[github-actions]

Test coverage for b226847

coverage-report: install_deps /home/runner/work/k8s-operator/k8s-operator/charms/worker/k8s> python -I -m pip install 'coverage[toml]'
coverage-report: commands[0] /home/runner/work/k8s-operator/k8s-operator/charms/worker/k8s> coverage report
Name                                    Stmts   Miss  Cover
-----------------------------------------------------------
lib/charms/k8s/v0/k8sd_api_manager.py     278     29    90%
src/charm.py                              500    260    48%
src/cloud_integration.py                   80      3    96%
src/config/extra_args.py                   29      2    93%
src/containerd.py                         140     22    84%
src/cos_integration.py                     33     12    64%
src/events/update_status.py                68     24    65%
src/inspector.py                           41      4    90%
src/kube_control.py                        39     31    21%
src/literals.py                            23      0   100%
src/protocols.py                           28      5    82%
src/reschedule.py                          77      4    95%
src/snap.py                               193     29    85%
src/token_distributor.py                  181    109    40%
src/upgrade.py                            108     48    56%
-----------------------------------------------------------
TOTAL                                    1818    582    68%
coverage-report: OK (1.21=setup[0.99]+cmd[0.21] seconds)
congratulations :) (1.26 seconds)

Static code analysis report

Run started:2024-12-20 19:29:21.331192

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 3864
  Total lines skipped (#nosec): 3
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):