Add CI to build JNI Sample for Android

.github/workflows/pull_request.yml

@@ -176,6 +176,30 @@ jobs:
       - name: Swift Test
         run: "swift test"
 
+  build-swift-android:
+    name: Sample SwiftJavaExtractJNISampleApp (Android) (${{ matrix.os_version }} swift:${{ matrix.swift_version }} jdk:${{matrix.jdk_vendor}} android:${{matrix.sdk_triple}})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        swift_version: ['nightly-main']
+        os_version: ['jammy']
+        jdk_vendor: ['corretto']
+        sdk_triple: ['x86_64-unknown-linux-android28']
+        ndk_version: ['r27d']
+    container:
+      image: ${{ (contains(matrix.swift_version, 'nightly') && 'swiftlang/swift') || 'swift' }}:${{ matrix.swift_version }}-${{ matrix.os_version }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Prepare CI Environment
+        uses: ./.github/actions/prepare_env
+      - name: Install Swift SDK for Android and build
+        run: |
+          apt-get -q update && apt-get -yq install curl
+          cd Samples/SwiftJavaExtractJNISampleApp
+          curl -s --retry 3 https://raw.githubusercontent.com/swiftlang/github-workflows/refs/heads/main/.github/workflows/scripts/install-and-build-with-sdk.sh | \
+          bash -s -- --android --build-command="swift build" --android-sdk-triple="${{ matrix.sdk_triple }}" --android-ndk-version="${{ matrix.ndk_version }}" ${{ matrix.swift_version }}
+
   verify-samples:
     name: Sample ${{ matrix.sample_app }} (${{ matrix.os_version }} swift:${{ matrix.swift_version }} jdk:${{matrix.jdk_vendor}})
     runs-on: ubuntu-latest

Samples/SwiftJavaExtractJNISampleApp/build.gradle

@@ -100,10 +100,19 @@ def jextract = tasks.register("jextract", Exec) {
         }
     }
 
+    // FIXME: disable prebuilts until swift-syntax isn't broken on 6.2 anymore: https://github.com/swiftlang/swift-java/issues/418
+    def cmdArgs = ["build", "--disable-experimental-prebuilts"]
+
+    // Check if the 'swiftSdk' project property was passed
+    if (project.hasProperty('swiftSdk')) {
+        // If it was, add the --sdk argument and its value
+        cmdArgs.add("--swift-sdk")
+        cmdArgs.add(project.property('swiftSdk').toString())
+    }
+
     workingDir = layout.projectDirectory
     commandLine "swift"
-    // FIXME: disable prebuilts until swift-syntax isn't broken on 6.2 anymore: https://github.com/swiftlang/swift-java/issues/418
-    args("build", "--disable-experimental-prebuilts") // since Swift targets which need to be jextract-ed have the jextract build plugin, we just need to build
+    args(cmdArgs) // since Swift targets which need to be jextract-ed have the jextract build plugin, we just need to build
     // If we wanted to execute a specific subcommand, we can like this:
     //     args("run",/*
     //             "swift-java", "jextract",