Support zsh shell in config

I have adjusted the config script, so it works on both bash and zsh shells. It would be ncie to also support arm64 platforms, so the warning

 ! analysis-manager-ui The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested  0.0s 
 ! pdb-api The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested              0.0s 
 ! analysis-manager-api The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested 0.0s 
 ! qc-analysis-api The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested      0.0s 

gets properly suppressed when starting the images on such a machine. This would require dedicated images, though. Which can be done automatically by adding linux/arm64 to the platforms in the Build and push task:

-
        name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile.base
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}

See for example https://github.com/HEPCompSim/DCSim/blob/main/.github/workflows/github-docker.yaml.