Looks like GetRepoRef doesn't correcly handle gitea repo refs response expecting
a single entry. Instead, at least with latest gitea version, the response is
always an array of refs. So use GetRepoRefs.
Allow setting the destination branch/tag/ref so users can test the run
conditions based on the branch/tag/ref.
To simulate a pull request an user can define a ref that matches one of these
regular expressions: `refs/pull/(\d+)/head`, `refs/merge-requests/(\d+)/head`
Just a raw replace of "github.com/pkg/errors".
Next steps will improve errors (like remote errors, api errors, not exist errors
etc...) to leverage its functionalities
Since the get tokens gitea api is used to do auth by username password we need
to know the api status code to detect if it's an unauthorized error (wrong
username/password) or another error.
Since the gitea client doesn't return the http response to inspect the status
code we'll use our own api call.
Simone Gotti