Currently:
- In the database, `NULL` is used in `action_runner_token.owner_id` & `.repo_id` to represent an absent value, as required by the foreign key
- In the code, `0` is used in `ActionRunnerToken.OwnerID` and `.RepoID` to represent an absent value
This PR replaces the `int64` fields with `optional.Option[int64]` which allows a single data type to be used for both cases, and removes the usage of the value `0` as a placeholder.
This change has a limited scope -- although `ActionRunnerToken` uses `NULL` values in the database, the related table `ActionRunner` still uses zero-values for `OwnerID` and `RepoID`. This means a lot of code interacting with both of these tables still uses `0` values, such as the UI. The changes here were stopped at a reasonable point to avoid cascading into all places that use the `ActionRunner` table. (I'll continue this work in the future to enable foreign keys on `ActionRunner`, but likely after #11516 is completed to avoid serious conflict resolution problems.)
## Checklist
The [contributor guide](https://forgejo.org/docs/next/contributor/) contains information that will be helpful to first time contributors. There also are a few [conditions for merging Pull Requests in Forgejo repositories](https://codeberg.org/forgejo/governance/src/branch/main/PullRequestsAgreement.md). You are also welcome to join the [Forgejo development chatroom](https://matrix.to/#/#forgejo-development:matrix.org).
### Tests for Go changes
(can be removed for JavaScript changes)
- I added test coverage for Go changes...
- [x] in their respective `*_test.go` for unit tests.
- [ ] in the `tests/integration` directory if it involves interactions with a live Forgejo server.
- I ran...
- [x] `make pr-go` before pushing
### Documentation
- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.
### Release notes
- [ ] This change will be noticed by a Forgejo user or admin (feature, bug fix, performance, etc.). I suggest to include a release note for this change.
- [x] This change is not visible to a Forgejo user or admin (refactor, dependency upgrade, etc.). I think there is no need to add a release note for this change.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11601
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net>
Co-committed-by: Mathieu Fenniak <mathieu@fenniak.net>
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