update syntax

Author: pdabelf5

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

@@ -190,9 +190,9 @@ jobs:
           build-args: |
             BUILD_OS=${{ matrix.image }}
             IC_VERSION=${{ needs.checks.outputs.ic_version }}
-          secret-files: |
-            "nginx-repo.crt=nginx-repo.crt"
-            "nginx-repo.key=nginx-repo.key"
+          secret-files:
+            nginx-repo.crt=./nginx-repo.crt
+            nginx-repo.key=./nginx-repo.key
 
       - name: Clean up secrets
         run: |