ci(workflow): update logic for integration test latest run on macos runner

[Sarthak-instill]

Because

• We have to update logic to run integration test latest workflow on macos runner

This commit

• update logic for integration test latest run on macos runner

[linear]

INS-2157 Need to add a logic to trigger that job only when it’s a push event to the main branch for latest on macOS only

pinglin said:

sarthak.gupta We have a security concern here, about the self-hosted GA runner when being triggered by a PR head branch. If the PR head branch contains malicious codes (something like rm -rf /), the runner will execute it without any protection. We need to add a logic to trigger that job only when it’s a push event to the main branch (i.e., a reviewed PR merge), assuming only repo maintainers and admins can push to the main branch.

<https://github.com/instill-ai/model/blob/main/.github/workflows/helm-integration-test-backend.yml | helm-integration-test-backend.yml>

[pinglin]

LGTM