Add a timeout to all shelljs exec

[aboutte]

Depending on what arguments are used it is possible p4 will expect user input forever. An example is the following:

      - name: p4 submit
        uses: setup-p4
        id: submit
        env:
          P4CLIENT: ci
        with:
          command: submit
          global_options: -I
          working_directory: "C:/Users/perforce/Perforce/ci/Game/"

Without -d being included in arguments p4 expects input from an interactive user.