Initial upload structure setup

packages/artifact/src/internal/upload-options.ts

@@ -0,0 +1,18 @@
+export interface UploadOptions {
+    /**
+     * Duration after which artifact will expire in days.
+     *
+     * By default artifact expires after 90 days:
+     * https://docs.github.com/en/actions/configuring-and-managing-workflows/persisting-workflow-data-using-artifacts#downloading-and-deleting-artifacts-after-a-workflow-run-is-complete
+     *
+     * Use this option to override the default expiry.
+     *
+     * Min value: 1
+     * Max value: 90 unless changed by repository setting
+     *
+     * If this is set to a greater value than the retention settings allowed, the retention on artifacts
+     * will be reduced to match the max value allowed on server, and the upload process will continue. An
+     * input of 0 assumes default retention setting.
+     */
+    retentionDays?: number
+  }