ci: add new continuous integration workflow

[paul58914080]

Description

1. Dependabot will now listen on directory ./example
2. CI workflow will be triggered when there is PR to main with dir 'example'
   a. It will build example
   b. It will commit & push the change of example to the template

Checklist:

• My code follows the contribution guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• My commits follow conventional commit message guidelines