fix(build): fix executors to account for sub-directories

[tbinna]

fix manifest.yml path construction to use the actual project root in build and tunnel executors

Closes: #38

[github-actions[bot]]

:tada: This PR is included in version 2.0.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: