Adding required file .github/workflows/dependabot-auto-merge.yml

[eclipse-otterdog]

This PR has been automatically created by otterdog due to a policy.

[github-actions]

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[karianna]

@gdams do we need to exclude otter-dog from the ECA list?

[netomi]

I amended and force-pushed all PRs that where created. We need to whitelist the otterdog app itself in the ECA check, a PR for that is open but not done yet: https://gitlab.eclipse.org/eclipsefdn/it/api/git-eca-rest-api/-/merge_requests/210