Restore test code. (opea-project#1502)

Remove nightly test code.

Signed-off-by: ZePan110 <ze.pan@intel.com>
Signed-off-by: Chingis Yundunov <YundunovCN@sibedge.com>

Author: ZePan110

.github/workflows/nightly-docker-build-publish.yml

@@ -9,7 +9,7 @@ on:
   workflow_dispatch:
 
 env:
-  EXAMPLES: "" #${{ vars.NIGHTLY_RELEASE_EXAMPLES }}
+  EXAMPLES: ${{ vars.NIGHTLY_RELEASE_EXAMPLES }}
   TAG: "latest"
   PUBLISH_TAGS: "latest"