fix(integration-tests): Make the caching continue on error

At times the caching mechanics behave weird. It's better to keep them as a soft-fail part of the pipeline.

.github/workflows/integration-tests.yml

@@ -92,6 +92,7 @@ jobs:
           docker save -o ors-test-scenario-builder.tar ors-test-scenario-builder:latest
       - name: Save the docker image to the cache
         uses: actions/cache/save@v4
+        continue-on-error: true
         with:
           path: |
             ors-test-scenario-builder.tar
@@ -108,6 +109,7 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Save the graphs to cache
+        continue-on-error: true
         uses: actions/cache/save@v4
         with:
           path: ors-test-scenarios/graphs-integrationtests