add pipe

Author: pdabelf5

.github/workflows/build-base-images.yml

@@ -190,7 +190,7 @@ jobs:
           build-args: |
             BUILD_OS=${{ matrix.image }}
             IC_VERSION=${{ needs.checks.outputs.ic_version }}
-          secret-files:
+          secret-files: |
             nginx-repo.crt=./nginx-repo.crt
             nginx-repo.key=./nginx-repo.key