fix(CI): Make the target branch dynamic in the CI

[mprahl]

Description of your changes:

This allows branches other than master to use the proper SDK on pushes.

Checklist:

• [x] You have signed off your commits
• [x] The title for your pull request (PR) should follow our title convention. Learn more about the pull request title convention used in this repository.

[google-oss-prow[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Once this PR has been reviewed and has the lgtm label, please assign humairak for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• .github/OWNERS
• backend/OWNERS
• test/OWNERS

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment

[mprahl]

/cc @hbelmiro @HumairAK

[mprahl]

/rerun-workflow "KFP e2e tests"

[mprahl]

/rerun-workflow "CI Check"