ci: fix build manifest output

Jenkinsfile

@@ -26,7 +26,8 @@ pipeline {
         DOTNET_CLI_HOME = "${WORKSPACE}/.ci/dotnet-home"
         POSTGRES_SERVICE_BUILD_TMPDIR = "${WORKSPACE}/.ci/fnos-build"
         LIVERECORDER_VERIFY_TMPDIR = "${WORKSPACE}/.ci/fnos-verify"
-        POSTGRES_SERVICE_SMOKE_TMPDIR = "${WORKSPACE}/.ci/fnos-smoke"
+        // Keep PostgreSQL's Unix-domain socket below Linux's 107-byte path limit.
+        POSTGRES_SERVICE_SMOKE_TMPDIR = "/tmp/postgresshare-smoke-${BUILD_NUMBER}"
     }
 
     stages {
@@ -101,7 +102,7 @@ payload = {
   'fpk':pathlib.Path(os.environ['FPK_PATH']).name,'fpkSha256':os.environ['fpk_sha'],
   'runtime':'PostgreSQL 15 + pgvector 0.8.6'
 }
-path.write_text(json.dumps(payload,ensure_ascii=False,indent=2)+'\n',encoding='utf-8')
+path.write_text(json.dumps(payload,ensure_ascii=False,indent=2)+chr(10),encoding='utf-8')
 PY
                     sha256sum "$MANIFEST_PATH" >"$MANIFEST_PATH.sha256"
                 '''
@@ -124,6 +125,9 @@ PY
 
     post {
         success { archiveArtifacts artifacts: 'artifacts/*.fpk,artifacts/*.sha256,artifacts/*.json', fingerprint: true }
-        always { cleanWs(deleteDirs: true, notFailBuild: true) }
+        always {
+            sh 'rm -rf -- "$POSTGRES_SERVICE_SMOKE_TMPDIR"'
+            cleanWs(deleteDirs: true, notFailBuild: true)
+        }
     }
 }