this one will work

Jenkinsfile-push-gitea-dockerhub

@@ -19,10 +19,7 @@ pipeline {
         stage('Push to Gitea') {
             steps {
                 git credentialsId: 'my-gitea-credentials', url: "${env.GITEA_REPO}"
-                sh '''
-                    git checkout -b master
-                    git push origin master
-                '''
+                sh 'git push origin master'
             }
         }
         stage('Push to Docker Hub') {