ci: use shared Gitea publish credential

Jenkinsfile

@@ -143,7 +143,11 @@ pipeline {
                     def json = """{"tag_name":"${env.RELEASE_TAG}","name":"${env.RELEASE_TAG}","body":"${bodyEscaped}","draft":false,"prerelease":false}"""
                     writeFile file: 'release_payload.json', text: json
 
-                    withCredentials([string(credentialsId: 'GITEA_TOKEN', variable: 'TOKEN')]) {
+                    withCredentials([usernamePassword(
+                        credentialsId: 'gitea-access-token',
+                        usernameVariable: 'GITEA_USER',
+                        passwordVariable: 'TOKEN'
+                    )]) {
                         bat """curl -sf -X POST "${env.GITEA_API_BASE}/repos/${env.GITEA_REPO_PATH}/releases" -H "Authorization: token %TOKEN%" -H "Content-Type: application/json" -d @release_payload.json"""
                     }
                     bat 'del release_payload.json'