Use Personal token to create Pull Request from GitHub Actions

[dtan4]

WHAT

Use Personal Access Token to create Pull Request from GitHub Actions instead of GitHub Action's token.

WHY

REF:

• PRs created don't trigger other actions · Issue #48 · peter-evans/create-pull-request
• https://help.github.com/en/actions/automating-your-workflow-with-github-actions/events-that-trigger-workflows#example-using-more-than-one-event

Triggering any actions from Pull Request created by Action's token is unavailable because of the safety reasons. Due to this, go mod tidy -> create a Pull Request -> run tests in GitHub Actions doesn't work.

[codecov-io]

Codecov Report

Merging #40 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #40   +/-   ##
=======================================
  Coverage   31.57%   31.57%           
=======================================
  Files           5        5           
  Lines         133      133           
=======================================
  Hits           42       42           
  Misses         88       88           
  Partials        3        3

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