ci(workflows): [ci] use github.event.pull_request.head.sha for codecov

- codecov/codecov-bash#83
- codecov/codecov-bash#83 (comment)
- https://docs.github.com/actions/using-workflows/events-that-trigger-workflows#pull_request

Signed-off-by: Lexus Drumgold <unicornware@flexdevelopment.llc>

Author: unicornware

.github/workflows/ci.yml

@@ -265,15 +265,15 @@ jobs:
           flags: ${{ format('node{0}', matrix.node-version) }}
           override_branch: ${{ env.REF }}
           override_build: ${{ github.run_id }}
-          override_commit: ${{ github.sha }}
+          override_commit: ${{ env.GITHUB_SHA }}
           token: ${{ secrets.CODECOV_TOKEN }}
           verbose: true
         env:
           GITHUB_JOB: ${{ github.job }}
           GITHUB_REF: ${{ github.ref }}
           GITHUB_REF_TYPE: ${{ github.ref_type }}
           GITHUB_RUN_ID: ${{ github.run_id }}
-          GITHUB_SHA: ${{ github.sha }}
+          GITHUB_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
           GITHUB_WORKSPACE: ${{ github.workspace }}
   build:
     needs: metadata