Convert to linux runner for creating releases

Author: aeisenberg

.github/workflows/release.yaml

@@ -5,7 +5,7 @@ on:
 jobs:
   createPrerelease:
     name: Create Release
-    runs-on: macos-latest
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions/cache@v1