Add GitHub Actions workflow to update OADP Go dependencies automatically

[kaovilai]

Signed-off-by: Tiger Kaovilai tkaovila@redhat.com

Why the changes were made

Eliminate need for #272 from maintainers

Keeps master, main, oadp-* up to date on oadp-operator and velero deps.

How to test the changes made

Sample: kaovilai#1, https://github.com/kaovilai/oadp-non-admin/actions/runs/14672155869/job/41180939148

You could also cherrypick to your own branch and push to your own master (so workflow_dispatch button works)
You can also cherrypick to branch and add push trigger.

[oadp-snyk]

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[Copilot]

Pull Request Overview

This PR introduces a new GitHub Actions workflow that periodically updates OADP Go dependencies and creates pull requests automatically for supported branches. Key changes include:

• Adding a scheduled (and manual via workflow_dispatch) workflow that runs on multiple branches (master, main, oadp-*).
• Extracting the Go version from go.mod and setting up the Go environment dynamically.
• Iterating over branches to create/update PR branches with updated dependencies using GitHub CLI.

[weshayutin]

nice patch co.... er. I mean @kaovilai :)

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaovilai, sseago

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