fix cache key

Author: lobsterkatie

.github/workflows/build.yml

@@ -22,7 +22,7 @@ env:
     ${{ github.workspace }}/packages/serverless/dist-awslambda-layer/*.zip
 
   # BUILD_CACHE_KEY: ${{ github.sha }}
-  BUILD_CACHE_KEY: ${{ "kmclb-test" }}
+  BUILD_CACHE_KEY: "kmclb-test"
 
 jobs:
   job_install_deps: