Fix Docker image loading in CI/CD pipeline

- Add 'load: true' to docker/build-push-action to make image available locally
- This fixes the 'Unable to find image' error in the Docker test step
- Image is now properly loaded into Docker daemon for testing

Author: RonaldRonnie

.github/workflows/ci.yml

@@ -217,6 +217,7 @@ jobs:
         context: .
         file: ./Dockerfile
         push: false
+        load: true
         tags: bioanalyzer-backend:test
         cache-from: type=gha
         cache-to: type=gha,mode=max