ci; fix timestamp label

Author: BoxBoxJason

.github/workflows/release.yml

@@ -80,6 +80,7 @@ jobs:
           echo "MAJOR=$MAJOR" >> $GITHUB_ENV
           echo "MINOR=$MINOR" >> $GITHUB_ENV
           echo "REPO_NAME=$REPO_NAME" >> $GITHUB_ENV
+          echo "CREATED=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_ENV
 
       - name: Log in to GHCR
         uses: docker/login-action@v3
@@ -101,14 +102,14 @@ jobs:
           build-args: |
             VERSION=${{ github.ref_name }}
           labels: |
-            org.opencontainers.image.title="${{ github.event.repository.name }}"
-            org.opencontainers.image.description="${{ github.event.repository.description }}"
-            org.opencontainers.image.source="${{ github.event.repository.html_url }}"
-            org.opencontainers.image.url="ghcr.io/boxboxjason/gitlab-sync"
-            org.opencontainers.image.created="${{ github.event }}"
-            org.opencontainers.image.revision="${{ github.sha }}"
-            org.opencontainers.image.version="${{ github.ref_name }}"
-            org.opencontainers.image.vendor="${{ github.repository_owner}}"
+            org.opencontainers.image.title=${{ github.event.repository.name }}
+            org.opencontainers.image.description=${{ github.event.repository.description }}
+            org.opencontainers.image.source=${{ github.event.repository.html_url }}
+            org.opencontainers.image.url=ghcr.io/boxboxjason/gitlab-sync
+            org.opencontainers.image.created=${{ env.CREATED }}
+            org.opencontainers.image.revision=${{ github.sha }}
+            org.opencontainers.image.version=${{ github.ref_name }}
+            org.opencontainers.image.vendor=${{ github.repository_owner}}
           tags: |
             ghcr.io/${{ env.REPO_NAME }}:${{ github.ref_name }}
             ghcr.io/${{ env.REPO_NAME }}:${{ env.MAJOR }}.${{ env.MINOR }}