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This section details on the original issue you should resolve

<issue_title>Repository branches API returns incorrect values for branches with /</issue_title>
<issue_description>Hi, I'm using Semaphore to provide an UI for Ansible deployments. I am running into an issue with what I think is the branch parsing logic.

Basically, I have a branch named env/test which represents the current state of the test environment. However, the endpoint seems to parse this branch name as just test. This prevents me from inputting env/test in the template edit UI and picking test leads to failure to run the template (because test branch does not exist).

The API itself seems okay with env/test because if I send the PUT /project/{}/templates/{} request manually it gets saved with the slash and runs correctly. I can also provide the branch name with a slash when overriding the branch name for a specific run in the UI.

I think this line is the culprit, where it parses the symbolic ref name by splitting at the last slash which breaks since we have a slash in the branch name.

semaphore/db_lib/CmdGitClient.go

Line 205 in ccaef54

if idx := strings.LastIndex(refPath, "/"); idx != -1 {

I think it should instead strip the refs/heads/ prefix and pick up anything after that.</issue_description>

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