chore: add cleanup for temporary tag message file

Add cleanup step to remove temporary file after tag creation.
While GitHub Actions runners are ephemeral, this follows best
practices for resource cleanup.

Addresses: Copilot review suggestion

Author: vivek.name: "Vivek Reddy

.github/workflows/create-release-tag.yml

@@ -119,6 +119,9 @@ EOF
           # Create annotated tag
           git tag -a "$TAG" -F /tmp/tag_message.txt
 
+          # Clean up temporary file
+          rm -f /tmp/tag_message.txt
+
           echo "✅ Created tag: $TAG"
 
       - name: Push tag to remote