Fix for build failed (#30)

* Set ubuntu version explicitly

* Test the action

* Trigger only master branch

Author: dmitriy-chernysh

.github/workflows/jekyll.yml

@@ -29,7 +29,7 @@ concurrency:
 jobs:
   # Build job
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4