Fix: Add useHttpPath to support multiple Git credentials on same host

[ab-ghosh]

Changes

This PR fixes a bug where multiple Git repositories on the same host could not use different credentials. When users linked multiple secrets to a ServiceAccount for different repositories on the same Git server (e.g., github.com/org/repo1 and github.com/org/repo2), Tekton would incorrectly use the first credential for all repositories, authentication failures. The root cause was that Git's credential helper only matched by hostname, ignoring the repository path. This fix adds useHttpPath = true to Git credential contexts, instructing Git to match credentials based on the full repository URL. The solution is backwards compatible, requires no configuration changes, and includes comprehensive test coverage including a new test specifically for this scenario.

• pkg/credentials/gitcreds/basic.go: Added useHttpPath=true to configBlurb()
• pkg/credentials/gitcreds/creds_test.go: Updated tests and added
  TestBasicFlagHandlingMultipleReposSameHost to verify the fix
• Fixed incorrect error message in test

Submitter Checklist

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Release Notes

Fixed Git credential matching to support multiple repositories on the same host with different credentials. Previously, when using multiple secrets for different repositories on the same Git server (e.g., github.com/org/repo1 and github.com/org/repo2), it incorrectly use the first credential for all repositories, causing authentication failures. Git credential contexts now include `useHttpPath = true`, enabling proper per-repository credential selection.

[tekton-robot]

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[tekton-robot]

@ab-ghosh: The label(s) kind/fix cannot be applied, because the repository doesn't have them.

In response to this:

/kind fix

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[ab-ghosh]

/kind bug