Change Docker build context to load-generator

Author: hjgraca

.github/workflows/docker-publish.yml

@@ -47,7 +47,7 @@ jobs:
         id: push
         uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
         with:
-          context: .
+          context: ./main-workshop/load-generator
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}