fix: ci to use the right context

Author: ayuskauskas

.github/workflows/build_container.yaml

@@ -50,7 +50,7 @@ jobs:
         id: push
         uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
         with:
-          context: .
+          context: ${{ env.PACKAGE_NAME }}
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}