add cron for e2e tests, twice a day (#162)

Author: dmitry-shibanov

.github/workflows/e2e-versions.yml

@@ -9,7 +9,8 @@ on:
   pull_request:
     paths-ignore:
       - '**.md'
-
+  schedule:
+    - cron:  '0 */12 * * *'
 jobs:
   setup-java-major-versions:
     name: ${{ matrix.distribution }} ${{ matrix.version }} (jdk-x64) - ${{ matrix.os }}