Use container image for tests job

Author: mads-hartmann

.github/workflows/ide-integration-tests.yml

@@ -30,6 +30,8 @@ jobs:
         name: Check for regressions
         needs: [configuration]
         runs-on: [self-hosted]
+        container:
+            image: eu.gcr.io/gitpod-core-dev/dev/dev-environment:mads-leeway-v0.7.3.4
         steps:
             - uses: actions/checkout@v3
             - name: Create preview environment infrastructure