Override commit in codecov actions to use PR merge commit (#1430)

Author: alejoberardino

.github/workflows/main.yml

@@ -38,6 +38,7 @@ jobs:
         with:
           flags: integration
           fail_ci_if_error: true
+          override_commit: ${{ github.sha }} # PR merge commit, what checkout@v2 uses by default
 
   run-unit-tests:
     name: Run unit tests
@@ -56,6 +57,7 @@ jobs:
         with:
           flags: unit
           fail_ci_if_error: true
+          override_commit: ${{ github.sha }} # PR merge commit, what checkout@v2 uses by default
 
   run-basic-checks:
     name: Run linters and unit tests