Add pyroscope volume to k8s Deployment

[alelevinas]

k8s logs show

Running Grafana v11.6.0 logging=false
Running Loki v3.4.3 logging=false
Running OpenTelemetry Collector v0.124.0 logging=false
Running Prometheus v3.2.1 logging=false
Waiting for the OpenTelemetry collector and the Grafana LGTM stack to start up...
Running Tempo v2.7.2 logging=false
mkdir: cannot create directory '/data/pyroscope': Permission denied
Prometheus is up and running. Startup time: 1 seconds
Loki is up and running. Startup time: 2 seconds
Tempo is up and running. Startup time: 2 seconds
OpenTelemetry collector is up and running. Startup time: 6 seconds
Grafana is up and running. Startup time: 27 seconds

And the pod is never in a Ready state

[alelevinas]

Related to #394

[zeitlinger]

thanks for the fix!