@Saturas we actually use distroless. We're discussing supporting something like variants of the image that use distroless-debug as the base image to help in these cases:
https://github.com/GoogleContainerTools/distroless#debug-images
In the mean time, you can make your own image by using a multi-step dockerfile that simply copies the spicedb binary from our image into something like an alpine or debian image that has a shell.