jattach does not work with Solr in Docker

I am running the solr:9.6.1 Docker image and want to create a heap dump.

According to the documentation this should be possible using jattach: https://solr.apache.org/guide/solr/latest/deployment-guide/solr-in-docker.html#debugging-with-jattach

If I open a shell in the container and enter the sample command from the documentation, this is what I get:

$ jattach 10 threaddump
Process 10 not found

using the default PID 1, there is a different error:

$ jattach 1 threaddump
Could not start attach mechanism: No such file or directory