fix: git private token not being set correctly for https

[khalid-sani]

Changes

when using gitprivatetoken, the build logs showed an error

warning: ***github.com/.insteadof has multiple values
error: cannot overwrite multiple values with a single value
Use a regexp, --add or --replace-all to change ***github.com/.insteadOf. 

substitution url for https did not work.
this fix would add a value for https instead of overwriting it

Checklist

• Read the contribution guide and accept the code of conduct
• Readme (updated or not needed)
• Tests (added, updated or not needed)

[github-actions]

[webbertakken]

Great!

Could you confirm that this works for you by using game-ci/unity-builder@c847cad57ec982833951d422bc9ec1ddd0ecd9b4?

[codecov-commenter]

Codecov Report

Merging #394 (c847cad) into main (d066039) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #394   +/-   ##
=======================================
  Coverage   53.30%   53.30%           
=======================================
  Files          64       64           
  Lines        1994     1994           
  Branches      338      368   +30     
=======================================
  Hits         1063     1063           
+ Misses        927      871   -56     
- Partials        4       60   +56     

Impacted Files	Coverage Δ
src/model/input.ts	92.61% <0.00%> (ø)
src/model/docker.ts	17.24% <0.00%> (ø)
src/model/system.ts	86.84% <0.00%> (ø)
src/model/cli/cli.ts	31.34% <0.00%> (ø)
src/model/image-tag.ts	54.44% <0.00%> (ø)
src/model/input-readers/git-repo.ts	47.36% <0.00%> (ø)
src/model/cloud-runner/cloud-runner.ts	79.31% <0.00%> (ø)
src/model/input-readers/action-yaml.ts	36.36% <0.00%> (ø)
src/model/cloud-runner/providers/aws/index.ts	16.66% <0.00%> (ø)
src/model/cloud-runner/providers/k8s/index.ts	12.00% <0.00%> (ø)
... and 12 more

[khalid-sani]

Tested. Works fine.