fix: IMAGE_TAG should be defined before build

Author: lotyp

.github/workflows/ci.yml

@@ -81,7 +81,7 @@ jobs:
           context: ./dist/${{ env.TEMPLATE }}
           load: true
           tags: ${{ steps.meta.outputs.tags }}
-          cache-from: type=registry,ref=${{ env.IMAGE_TAG }}
+          cache-from: type=registry,ref=${{ env.IMAGE_NAMESPACE }}:${{ env.TEMPLATE }}-latest
           cache-to: type=inline
           labels: ${{ steps.meta.outputs.labels }}