CI actions are duplicated for pull requests

[tymokvo]

The current GitHub actions settings are doubling the CI work by running on the push and pull_request events. See here for an example. The runs on the left nav bar are identical.

One solution is to limit the push event to the master branch.

[mostaphaRoudsari]

Good point! Since we only merge the PR if they pass the tests we don't need to re-run them for the push! We should fix this in several repositories.