fix examples

Author: stanislav-shchetinin

.github/workflows/examples.yaml

@@ -12,9 +12,13 @@ jobs:
   main:
     name: Examples
     runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false
+      matrix:
+        ydb-version: [23.3, 24.1]
     services:
       ydb:
-        image: ydbplatform/local-ydb:latest
+        image: ydbplatform/local-ydb:${{ matrix.ydb-version }}
         ports:
           - 2135:2135
           - 2136:2136
@@ -27,6 +31,34 @@ jobs:
           YDB_TABLE_ENABLE_PREPARED_DDL: true
         options: '-h localhost'
     steps:
+    - name: Checkout PR
+      uses: actions/checkout@v3
+      if: github.event.pull_request.head.sha != ''
+      with:
+        submodules: true
+        ref: ${{ github.event.pull_request.head.sha }}
+    - name: Checkout
+      uses: actions/checkout@v3
+      if: github.event.pull_request.head.sha == ''
+      with:
+        submodules: true
+    - name: Install dependencies
+      uses: ./.github/actions/prepare_vm
+    - name: Prepare ccache timestamp
+      id: ccache_cache_timestamp
+      shell: cmake -P {0}
+      run: |
+        string(TIMESTAMP current_date "%Y-%m-%d-%H;%M;%S" UTC)
+        message("::set-output name=timestamp::${current_date}")
+    - name: Restore cache files
+      uses: actions/cache/restore@v4
+      with:
+        path: ~/.ccache
+        key: ubuntu-22.04-ccache-${{steps.ccache_cache_timestamp.outputs.timestamp}}
+        restore-keys: |
+          ubuntu-22.04-ccache-
+    - name: Build
+      uses: ./.github/actions/build
     - name: Launch basic example
       shell: bash
       run: |