This commit fixes error when updating multiple confluence attachments

Essentially, it uploads attachments one at a time instead of in
parallel. Currently using a 0.8 second delay.

Author: Fred Gruber

src/publish/confluence/confluence.ts

@@ -435,15 +435,26 @@ async function publish(
         LogPrefix.ATTACHMENT,
       );
 
-      const uploadAttachmentsResult = await Promise.all(
-        uploadAttachments(
-          publishFiles.baseDir,
-          attachmentsToUpload,
-          toUpdate.id,
-          fileName,
-          existingAttachments,
-        ),
-      );
+	const uploadAttachmentsResult: unknown[] = [];
+
+	for (const att of attachmentsToUpload) {
+	    // Start exactly ONE upload by calling the helper with a single attachment
+	    const tasks = uploadAttachments(
+		publishFiles.baseDir,
+		[att],                    // <-- one at a time
+		toUpdate.id,
+		fileName,
+		existingAttachments,
+	    ) as Promise<unknown>[];    // uploadAttachments returns an array of Promises
+
+	    const res = await tasks[0];
+	    uploadAttachmentsResult.push(res);
+
+	    // short backoff (milliseconds)
+	    const t0 = performance.now();
+	    await new Promise<void>(r => setTimeout(r, 800)); // 0.8s
+	    trace("[ATTACHMENT] sleptMs", { ms: Math.round(performance.now() - t0) }, LogPrefix.ATTACHMENT);
+	}
       trace(
         "uploadAttachmentsResult",
         uploadAttachmentsResult,