Add E2E test workflow

Runs sdk-e2e-tests suite against the e2e-cli to verify SDK behavior.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: MichaelGHSeg

.github/workflows/e2e-tests.yml

@@ -0,0 +1,76 @@
+# E2E Tests for analytics-java
+# Copy this file to: analytics-java/.github/workflows/e2e-tests.yml
+#
+# This workflow:
+# 1. Checks out the SDK and sdk-e2e-tests repos
+# 2. Builds the SDK and e2e-cli
+# 3. Runs the e2e test suite
+
+name: E2E Tests
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+  workflow_dispatch: # Allow manual trigger
+
+jobs:
+  e2e-tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout SDK
+        uses: actions/checkout@v4
+        with:
+          path: sdk
+
+      - name: Checkout sdk-e2e-tests
+        uses: actions/checkout@v4
+        with:
+          repository: segmentio/sdk-e2e-tests
+          path: sdk-e2e-tests
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '11'
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Build Java SDK and e2e-cli
+        working-directory: sdk
+        run: mvn package -pl e2e-cli -am -DskipTests
+
+      - name: Find e2e-cli jar
+        id: find-jar
+        working-directory: sdk
+        run: |
+          JAR_PATH=$(find e2e-cli/target -name "e2e-cli-*-jar-with-dependencies.jar" | head -1)
+          echo "jar_path=$JAR_PATH" >> $GITHUB_OUTPUT
+
+      - name: Install sdk-e2e-tests dependencies
+        working-directory: sdk-e2e-tests
+        run: npm ci
+
+      - name: Build sdk-e2e-tests
+        working-directory: sdk-e2e-tests
+        run: npm run build
+
+      - name: Run E2E tests
+        working-directory: sdk-e2e-tests
+        env:
+          CLI_COMMAND: java -jar ${{ github.workspace }}/sdk/${{ steps.find-jar.outputs.jar_path }}
+        run: npm test
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: e2e-test-results
+          path: sdk-e2e-tests/test-results/
+          if-no-files-found: ignore