New try

Jenkinsfile

@@ -50,12 +50,12 @@ pipeline {
                 def buildDesc = currentBuild.currentResult == 'SUCCESS' ? 'Build successful' : 'Build failed'
 
                 // Notify Gitea using the API (requires credential in Jenkins)
-                withCredentials([string(credentialsId: 'jenkins', variable: 'GITEA_TOKEN')]) {
+                withCredentials([[$class: 'StringBinding', credentialsId: 'jenkins', variable: 'GITEA_TOKEN']]) {
                     sh """
                     curl -f -X POST "${GITEA_API_URL}/repos/${GITEA_REPO_PATH}/statuses/${commitSha}" \
-                         -H "Authorization: token ${GITEA_TOKEN}" \
-                         -H "Content-Type: application/json" \
-                         -d '{"state": "${buildState}", "target_url": "${env.BUILD_URL}", "description": "${buildDesc}", "context": "jenkins-ci"}'
+                        -H "Authorization: token ${GITEA_TOKEN}" \
+                        -H "Content-Type: application/json" \
+                        -d '{"state": "${buildState}", "target_url": "${env.BUILD_URL}", "description": "${buildDesc}", "context": "jenkins-ci"}'
                     """
                 }
             }