#302 [part 1] Add GitHub workflow to validate samples (#327)

#302 Add GitHub workflow to validate samples

## Motivation and Context
<!-- Why is this change needed? What problem does it solve? -->

## How Has This Been Tested?
<!-- Have you tested this in a real application? Which scenarios were
tested? -->

## Breaking Changes
<!-- Will users need to update their code or configurations? -->

## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context
<!-- Add any other context, implementation notes, or design decisions
-->

Author: kpavlov

.github/workflows/samples.yml

@@ -0,0 +1,58 @@
+name: Build Samples
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches: [ main ]
+    paths:
+      - 'samples/**'
+  push:
+    branches: [ main ]
+    paths:
+      - 'samples/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  # Cancel only when the run is NOT on `main` branch
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        sample:
+          - kotlin-mcp-client
+          - kotlin-mcp-server
+          - weather-stdio-server
+
+    name: Build Sample
+    timeout-minutes: 10
+    env:
+      JAVA_OPTS: "-Xmx8g -Dfile.encoding=UTF-8 -Djava.awt.headless=true -Dkotlin.daemon.jvm.options=-Xmx6g"
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v5
+        with:
+          java-version: 21
+          distribution: 'temurin'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v5
+        with:
+          add-job-summary: 'always'
+          cache-read-only: true
+
+      - name: "Build Sample: ${{ matrix.sample }}"
+        working-directory: ./samples/${{ matrix.sample }}
+        run: ./../../gradlew --no-daemon clean build
+
+      - name: Upload Reports
+        if: ${{ !cancelled() }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: reports-${{ matrix.sample }}
+          path: |
+            **/build/reports/