update CI workflow (#148)

* update CI workflow

* run CI also on PR

* provide memcached for CI tests

Author: onli

.github/workflows/ci.yml

@@ -1,22 +1,19 @@
 name: CI
 
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
+on: [push, pull_request]
 
 jobs:
   test:
 
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: niden/actions-memcached@v7
+      - uses: actions/checkout@v6
       - name: Set up Ruby
-        uses: ruby/setup-ruby@359bebbc29cbe6c87da6bc9ea3bc930432750108
+        uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.1'
+          ruby-version: '3.4'
           bundler-cache: true
       - name: Install dependencies
         run: bundle install