Change e2e tests for gradle changes

- Fix e2e workflow to build with gradle.
- Fix e2e paths to ones generated by gradle.
- Relates #470

.github/workflows/e2e.yml

@@ -28,7 +28,7 @@ jobs:
         with:
           distribution: adopt
           java-version: 17
-          cache: maven
+          cache: gradle
       - uses: graalvm/setup-graalvm@v1
         with:
           version: ${{ matrix.graal }}
@@ -40,15 +40,15 @@ jobs:
         with:
           node-version: '16'
       - run: |
-          ./mvnw clean package -Pnativex
+          ./gradlew clean build nativeCompile
       - uses: actions/upload-artifact@v2
         with:
           name: spring-shell-samples-${{ matrix.nickname }}
           retention-days: 1
           path: |
-            spring-shell-samples/target/*.jar
-            spring-shell-samples/target/spring-shell-samples
-            spring-shell-samples/target/spring-shell-samples.exe
+            spring-shell-samples/build/libs/*.jar
+            spring-shell-samples/build/native/nativeCompile/spring-shell-samples
+            spring-shell-samples/build/native/nativeCompile/spring-shell-samples.exe
       - name: compile e2e module
         working-directory: e2e/spring-shell-e2e
         run: |