closes#1743
fixes: setting secrets for own user namespace
- create org in database
- use orgID for org related APIs
Co-authored-by: 6543 <6543@obermui.de>
In order to test this functionality, we had to expose the `BranchHead()`
through an API endpoint
```
GET /repos/{repo_id}/branches/{branch}/head
```
The response is a string that contains the latest commit hash of the
requested branch.
