Add tx to formatMarkers

[changelog:added]

lib/github/operation.ts

@@ -18,6 +18,7 @@ import { Octokit } from "@octokit/rest"; // eslint-disable-line @typescript-esli
 
 import { Contextual } from "../handler/handler";
 import { debug, error, info, warn } from "../log/console";
+import { isSubscriptionIncoming } from "../payload";
 import { AuthenticatedRepositoryId } from "../repository/id";
 import { GitHubAppCredential, GitHubCredential } from "../secret/provider";
 import { toArray } from "../util";
@@ -72,6 +73,9 @@ export function formatMarkers(
 	ctx: Contextual<any, any>,
 	...tags: string[]
 ): string {
+	const tx = isSubscriptionIncoming(ctx.trigger)
+		? ctx.trigger.subscription.tx
+		: undefined;
 	return `
 <!--
   [atomist:generated]
@@ -80,7 +84,12 @@ export function formatMarkers(
   [atomist-configuration:${toArray(ctx.configuration)
 		.map(c => c.name)
 		.join(",")}]
-  [atomist-workspace-id:${ctx.workspaceId}]
+  [atomist-workspace-id:${ctx.workspaceId}]${
+		tx
+			? `
+  [atomist-tx:${tx}]`
+			: ""
+	}
   [atomist-correlation-id:${ctx.correlationId}]${
 		tags.length > 0 ? "\n" : ""
 	}${tags.map(t => `  [${t}]`).join("\n")}