Fix nightly isssue (opea-project#2196)

Signed-off-by: ZePan110 <ze.pan@intel.com>
Signed-off-by: cogniware-devops <ambarish.desai@cogniware.ai>

Author: ZePan110

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

@@ -25,7 +25,7 @@ on:
   workflow_dispatch:
 
 env:
-  EXAMPLES: #${{ vars.NIGHTLY_RELEASE_EXAMPLES }}
+  EXAMPLES: ${{ vars.NIGHTLY_RELEASE_EXAMPLES }}
   TAG: "latest"
   PUBLISH_TAGS: "latest"