Fix integration-tests workflow (#27)

## Purpose

Fix issues in integration tests workflow + make it run in PR's

## Checklist

- [x] My code follows the style of this project.
- [x] The code compiles without warnings.
- [x] I have performed a self-review of the changes.
- [x] I have documented my code, in particular the intent of the
      hard-to-understand areas.
- [ ] (If necessary) I have updated the CHANGELOG.

.github/workflows/integration-tests.yml

@@ -4,6 +4,8 @@ on:
     # Trigger the workflow on pushes to the main and feature branches.
     push:
         branches: [main, feature/**]
+    pull_request:
+        branches: [main, feature/**]
 
     # Allows us to run the workflow manually from the Actions tab
     workflow_dispatch:
@@ -26,8 +28,9 @@ jobs:
           flutter-version: ${{ env.flutter_version }}
           channel: 'stable'
           cache: true
-      - uses: actions/setup-java@v1
+      - uses: actions/setup-java@v2
         with:
+          distribution: 'zulu'
           java-version: '11'
 
       # Run integration test with android emulator
@@ -68,4 +71,4 @@ jobs:
           channel: 'stable'
           cache: true
       - uses: nanasess/setup-chromedriver@v2
-      - run: chromedriver --port=4444 & ./integration_test/run_tests.sh
+      - run: chromedriver --port=4444 & ./integration_test/run_web_tests.sh