[CI Problem] Merge to `main` branch is not blocked on Github Actions

[mehrdadh]

Looking at this file, it seems that we only block merge on Jenkins flows. This issue has caused problem before where the committer missed Github Action builds and accidentally merged a PR.
Since we are using more Github Action flows, we should block merging based on those actions.

cc @driazati @gigiblender

[infdahai]

maybe just add tvm-ci/pr-head in the end? 7bc90ef