Resolved: run CI workflow only when code inside waspc/ changes

[suyog-patil-21]

Description

Fix Haskell CI workflow only when code inside waspc/ changes (Fixes #291).

Select what type of change this PR introduces:

1. Just code/docs improvement (no functional change).
2. Bug fix (non-breaking change which fixes an issue).
3. New feature (non-breaking change which adds functionality).
4. Breaking change (fix or feature that would cause existing functionality to not work as expected).

[infomiho]

@suyog-patil-21 do you know why did it run for this PR?

[suyog-patil-21]

As GitHub Action workflow was changed. this PR required a approval to run.
So on the Maintainers console there is a button "Approve and Run".
So When the Maintainer approved it that why this PR's WASPC-CI workflow. ran.

[suyog-patil-21]

I just noticed that this workflow will not work for on pull_request event. I will fix this. Please do not merge this PR.

[suyog-patil-21]

I have fix the on pull_request event. You can now merge this PR

[Martinsos]

@suyog-patil-21 looking good!
I wonder if we could easily test this. I will create two dummy PRs to see how this behaves.

[Martinsos]

Nice job @suyog-patil-21 , works good, merging!