Attempt #2 at preventing codacy coverage step from running on forks (#3572)

- **PR Description**

First attempt didn't work. Let's try this one, based on
https://github.com/orgs/community/discussions/25217

<img width="910" alt="image"
src="fa2e82b0-db34-486b-8bea-ec3807d10a33">

- **Please check if the PR fulfills these requirements**

* [ ] Cheatsheets are up-to-date (run `go generate ./...`)
* [ ] Code has been formatted (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#code-formatting))
* [ ] Tests have been added/updated (see
[here](https://github.com/jesseduffield/lazygit/blob/master/pkg/integration/README.md)
for the integration test guide)
* [ ] Text is internationalised (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#internationalisation))
* [ ] Docs (specifically `docs/Config.md`) have been updated if
necessary
* [ ] You've read through your own file changes for silly mistakes etc

<!--
Be sure to name your PR with an imperative e.g. 'Add worktrees view'
see https://github.com/jesseduffield/lazygit/releases/tag/v0.40.0 for
examples
-->

.github/workflows/ci.yml

@@ -188,7 +188,7 @@ jobs:
   upload-coverage:
     # List all jobs that produce coverage files
     needs: [unit-tests, integration-tests]
-    if: github.event.repository.fork == false
+    if: github.event.pull_request.head.repo.full_name == github.repository
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code