ci: support http on in-cluster git server

[sdowell]

No description provided.

[google-oss-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[sdowell]

/assign @karlkfi

[sdowell]

/hold