Trigger a build in Travis CI when code changes are push to a GitHub repo

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This workflow allows you to trigger a build in Travis CI when code changes are pushed to a GitHub repo or a pull request gets opened. GitHub Trigger node: This node will trigger the workflow when changes are pushed or when a pull request is created, updated, or deleted. IF node: This node checks for the action type. We want to trigger a build when code changes are pushed or when a pull request is opened. We don't want to build the project when a PR is closed or updated. TravisCI node: This