Ignore cache exporting errors in the image building workflows

Signed-off-by: Yuki Iwai <[email protected]>

.github/workflows/template-publish-image/action.yaml

@@ -52,5 +52,5 @@ runs:
         file: ${{ inputs.dockerfile }}
         push: ${{ inputs.push }}
         tags: ${{ steps.meta.outputs.tags }}
-        cache-from: type=gha
+        cache-from: type=gha,ignore-error=true
         cache-to: type=gha