Accept more main branch names for login detection (#396)

Also consider `main` and `trunk` as options
to determine a login through its configured remote

fixes #381

Co-authored-by: Norwin <git@nroo.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/396
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-by: Alexey 〒erentyev <axifive@noreply.gitea.io>
Co-authored-by: Norwin <noerw@noreply.gitea.io>
Co-committed-by: Norwin <noerw@noreply.gitea.io>

modules/context/context.go

@@ -166,11 +166,15 @@ func contextFromLocalRepo(repoPath, remoteValue string) (*git.TeaRepo, *config.L
 		}
 		if len(gitConfig.Remotes) > 1 {
 			// if master branch is present, use it as the default remote
-			masterBranch, ok := gitConfig.Branches["master"]
+			mainBranches := []string{"main", "master", "trunk"}
+			for _, b := range mainBranches {
+				masterBranch, ok := gitConfig.Branches[b]
 				if ok {
 					if len(masterBranch.Remote) > 0 {
 						remoteValue = masterBranch.Remote
 					}
+					break
+				}
 			}
 		}
 	}