Allow running antithesis tests locally

[nwnt]

Fix #19875

Tested this by running:

docker-compose up

and then

go run ./test-template/robustness/main.go --local

And the test completed successfully.

[k8s-ci-robot]

Hi @nwnt. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nwnt, serathius

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