Use github.context.payload... to determine if running on fork

lib/init-action-post-helper.js

@@ -24,6 +24,7 @@ var __importStar = (this && this.__importStar) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.run = exports.tryUploadSarifIfRunFailed = void 0;
+const github = __importStar(require("@actions/github"));
 const actionsUtil = __importStar(require("./actions-util"));
 const api_client_1 = require("./api-client");
 const codeql_1 = require("./codeql");
@@ -117,7 +118,7 @@ async function run(uploadDatabaseBundleDebugArtifact, uploadLogsDebugArtifact, p
     // We do not delete uploaded SARIFs if we're on a fork, as we're missing the
     // appropriate permissions.
     if (process.env["CODEQL_ACTION_EXPECT_UPLOAD_FAILED_SARIF"] === "true" &&
-        repositoryNwo.owner !== "github") {
+        github.context.payload.pull_request?.head.repo.fork === false) {
         await removeUploadedSarif(uploadFailedSarifResult, logger);
     }
     // Upload appropriate Actions artifacts for debugging