Modify git-init symbolic ref test to use tektoncd-owned repo or similar

[ghost]

Expected Behavior

Our tests rely on resources that are directly under the tektoncd org's control so that changes outside our control do not negatively affect test results.

Actual Behavior

The git-init symbolic ref test introduced in #2835 (test/git_checkout_test.go and test/v1alpha1/git_checkout_test.go) currently relies on an outside repo, https://github.com/spring-projects/spring-petclinic. This is done because spring-petclinic uses an atypical default branch of "main" instead of the more typical "master".

Additional Info

There are a couple of solutions to this problem:

1. Set up a repository under the tektoncd org that also uses an atypical default branch name.
2. Use a sidecar to host a git repo local to the test and set the default branch in that repo. An example of using a sidecar as git remote is available here.

[tekton-robot]

Rotten issues close after 30d of inactivity.
Reopen the issue with /reopen.
Mark the issue as fresh with /remove-lifecycle rotten.

/close

Send feedback to tektoncd/plumbing.

[tekton-robot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
Rotten issues close after an additional 30d of inactivity.
If this issue is safe to close now please do so with /close.

/lifecycle rotten

Send feedback to tektoncd/plumbing.

[tekton-robot]

@tekton-robot: Closing this issue.

In response to this:

Rotten issues close after 30d of inactivity.
Reopen the issue with /reopen.
Mark the issue as fresh with /remove-lifecycle rotten.

/close

Send feedback to tektoncd/plumbing.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[vdemeester]

/remove-lifecycle rotten
/remove-lifecycle stale
/reopen

[tekton-robot]

@vdemeester: Reopened this issue.

In response to this:

/remove-lifecycle rotten
/remove-lifecycle stale
/reopen

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[tekton-robot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close.

/lifecycle stale

Send feedback to tektoncd/plumbing.

[vdemeester]

/remove-lifecycle stale

[tekton-robot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale with a justification.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close with a justification.
If this issue should be exempted, mark the issue as frozen with /lifecycle frozen with a justification.

/lifecycle stale

Send feedback to tektoncd/plumbing.

[tekton-robot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten with a justification.
Rotten issues close after an additional 30d of inactivity.
If this issue is safe to close now please do so with /close with a justification.
If this issue should be exempted, mark the issue as frozen with /lifecycle frozen with a justification.

/lifecycle rotten

Send feedback to tektoncd/plumbing.

[ghost]

/remove-lifecycle rotten

This would still be a nice-to-have. Now that we've switched many/most/all of our repos over to "main" branch I think any of them could be a good candidate.

[tekton-robot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale with a justification.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close with a justification.
If this issue should be exempted, mark the issue as frozen with /lifecycle frozen with a justification.

/lifecycle stale

Send feedback to tektoncd/plumbing.

[ghost]

/remove-lifecycle stale