delete: env in CURRENT_DATETIME

Author: a5chin

.github/workflows/publish-devcontainer.yml

@@ -50,7 +50,7 @@ jobs:
             type=raw,value=latest,enable={{is_default_branch}}
           labels: |
             maintainer=a5chin <a5chin.origin+contact@gmain.com>
-            org.opencontainers.image.created=${{ env.CURRENT_DATETIME }}
+            org.opencontainers.image.created=${{ CURRENT_DATETIME }}
             org.opencontainers.image.url=https://github.com/a5chin/python-uv
             org.opencontainers.image.source=https://github.com/a5chin/python-uv
             org.opencontainers.image.vendor=a5chin <a5chin.origin+contact@gmain.com>