Add support GitHub Actions to README.

[M-Yamashita01]

This PR is based on #78

The #78 PR did not have GitHub Actions support written in README.
Therefore, we added GitHub Actions support.

[height]

Link Height tasks by mentioning a task ID in the pull request title or commit messages, or description and comments with the keyword link (e.g. "Link T-123").

💡Tip: You can also use "Close T-X" to automatically close a task when the pull request is merged.

[thomasrockhu-codecov]

Closing due to deprecation