Manually convert response.data to a JSON string.

lib/upload-lib.js

@@ -71,7 +71,7 @@ async function uploadPayload(payload) {
         const requestID = response.headers["x-github-request-id"];
         // On any other status code that's not 5xx mark the upload as failed
         if (!statusCode || statusCode < 500 || statusCode >= 600) {
-            core.setFailed('Upload failed (' + requestID + '): (' + statusCode + ') ' + response.data);
+            core.setFailed('Upload failed (' + requestID + '): (' + statusCode + ') ' + JSON.stringify(response.data));
             return false;
         }
         // On a 5xx status code we may retry the request
@@ -79,7 +79,7 @@ async function uploadPayload(payload) {
             // Log the failure as a warning but don't mark the action as failed yet
             core.warning('Upload attempt (' + (attempt + 1) + ' of ' + (backoffPeriods.length + 1) +
                 ') failed (' + requestID + '). Retrying in ' + backoffPeriods[attempt] +
-                ' seconds: (' + statusCode + ') ' + response.data);
+                ' seconds: (' + statusCode + ') ' + JSON.stringify(response.data));
             // Sleep for the backoff period
             await new Promise(r => setTimeout(r, backoffPeriods[attempt] * 1000));
             continue;
@@ -88,7 +88,7 @@ async function uploadPayload(payload) {
             // If the upload fails with 5xx then we assume it is a temporary problem
             // and not an error that the user has caused or can fix.
             // We avoid marking the job as failed to avoid breaking CI workflows.
-            core.error('Upload failed (' + requestID + '): (' + statusCode + ') ' + response.data);
+            core.error('Upload failed (' + requestID + '): (' + statusCode + ') ' + JSON.stringify(response.data));
             return false;
         }
     }