Add git username config option

[arturo-seijas]

Applicable spec:

Overview

Add git username config option

Rationale

Needed as per https://help.launchpad.net/Code/Git

Checklist

• The contributing guide was applied
• The PR is tagged with appropriate label (urgent, trivial, complex)

[github-actions]

Test coverage for 2827d58

Name                                       Stmts   Miss Branch BrPart  Cover   Missing
--------------------------------------------------------------------------------------
httprequest_lego_provider/__init__.py          1      0      0      0   100%
httprequest_lego_provider/apps.py              5      0      0      0   100%
httprequest_lego_provider/dns.py              61      0      8      0   100%
httprequest_lego_provider/forms.py            20      0      2      0   100%
httprequest_lego_provider/models.py           10      0      0      0   100%
httprequest_lego_provider/serializers.py      11      0      0      0   100%
httprequest_lego_provider/settings.py          6      0      0      0   100%
httprequest_lego_provider/urls.py              8      0      0      0   100%
httprequest_lego_provider/views.py            48      0      8      0   100%
--------------------------------------------------------------------------------------
TOTAL                                        170      0     18      0   100%

Static code analysis report

Run started:2024-02-01 11:58:06.771672

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 840
  Total lines skipped (#nosec): 0
  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):

[gtrkiller]

LGTM