deploy and skip using commit message

[jaeyson]

the following commit message can be used for:

• skipping ci builds if not needed
• deploy via fly

By using commit message, we're triggering events so it doesn't automatically do every steps described in workflow file.

Example:

• for skipping ci builds: `git commit -m "fix typo in html [skip ci]"
• for triggering deploys: `git commit -m "fix search bar not working when empty input [deploy fly]"

Note: the square brackets ([...]) are important here, as it is being checked in the commit message itself.

github docs <-- find head_commit