split out samples into separate job

Author: ktoso

.github/workflows/pull_request.yml

@@ -104,9 +104,6 @@ jobs:
       - name: Install JDK
         if: steps.cache-jdk.outputs.cache-hit != 'true'
         run: "bash -xc 'JDK_VENDOR=${{ matrix.jdk_vendor }} ./docker/install_jdk.sh'"
-        # TODO: not using setup-java since incompatible with the swiftlang/swift base image
-        #      - name: Install Untested Nightly Swift
-        #        run: "bash -xc './docker/install_untested_nightly_swift.sh'"
       - name: Cache local Gradle repository
         uses: actions/cache@v4
         continue-on-error: true
@@ -128,6 +125,36 @@ jobs:
             ${{ runner.os }}-swiftpm-
       - name: Test Swift
         run: "swift test"
+
+  verify-samples:
+    name: Verify Samples (swift:${{ matrix.swift_version }} jdk:${{matrix.jdk_vendor}} os:${{ matrix.os_version }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        swift_version: ['6.0.2']
+        os_version: ['jammy']
+        jdk_vendor: ['Corretto']
+    container:
+      image: ${{ (contains(matrix.swift_version, 'nightly') && 'swiftlang/swift') || 'swift' }}:${{ matrix.swift_version }}-${{ matrix.os_version }}
+    env:
+      JAVA_HOME: "/usr/lib/jvm/default-jdk"
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install System Dependencies
+        run: apt-get -qq update && apt-get -qq install -y make curl wget libjemalloc2 libjemalloc-dev
+      - name: Cache JDK
+        id: cache-jdk
+        uses: actions/cache@v4
+        continue-on-error: true
+        with:
+          path: /usr/lib/jvm/default-jdk/
+          key: ${{ runner.os }}-jdk-${{ matrix.jdk_vendor }}-${{ hashFiles('/usr/lib/jvm/default-jdk/*') }}
+          restore-keys: |
+            ${{ runner.os }}-jdk-
+      - name: Install JDK
+        if: steps.cache-jdk.outputs.cache-hit != 'true'
+        run: "bash -xc 'JDK_VENDOR=${{ matrix.jdk_vendor }} ./docker/install_jdk.sh'"
       - name: Verify Samples (All)
         run: .github/scripts/validate_samples.sh
         # TODO: Benchmark compile crashes in CI, enable when nightly toolchains in better shape.