Added separated action for validate master branch

Author: alex268

.github/workflows/validate.yaml

@@ -0,0 +1,36 @@
+name: Validate YDB Examples
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Validate YDB Examples
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        java: [ '8', '11', '17']
+
+    env:
+        MAVEN_ARGS: --batch-mode --update-snapshots -Dstyle.color=always
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up JDK
+        uses: actions/setup-java@v3
+        with:
+          java-version: ${{ matrix.java }}
+          distribution: 'temurin'
+          cache: 'maven'
+
+      - name: Download dependencies
+        run: mvn $MAVEN_ARGS dependency:go-offline
+
+      - name: Build with Maven
+        run: mvn $MAVEN_ARGS package
+

README.md

@@ -1,5 +1,5 @@
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/ydb-platform/ydb-java-examples/blob/main/LICENSE)
-[![Build](https://img.shields.io/github/actions/workflow/status/ydb-platform/ydb-java-examples/build.yaml)](https://github.com/ydb-platform/ydb-java-examples/actions/workflows/build.yaml)
+[![Build](https://img.shields.io/github/actions/workflow/status/ydb-platform/ydb-java-examples/validate.yaml)](https://github.com/ydb-platform/ydb-java-examples/actions/workflows/validate.yaml)
 
 ## YDB Java SDK examples