feat: add configurable shmSizeLimit for /dev/shm in jupyterlab chart

Introduce shmSizeLimit value (default 512Mi) to control the size of the
RAM-backed /dev/shm volume. Leave empty to apply no limit.

manifests/helm/jupyterlab/1.0.0/templates/deployment.yaml

@@ -103,3 +103,6 @@ spec:
         - name: dshm
           emptyDir:
             medium: Memory
+            {{- if .Values.shmSizeLimit }}
+            sizeLimit: {{ .Values.shmSizeLimit }}
+            {{- end }}

manifests/helm/jupyterlab/1.0.0/values.yaml

@@ -74,5 +74,8 @@ dataVolume:
 #     mountPath: "/group_data"
 groupVolumes: []
 
+# /dev/shm shared memory size limit (e.g. "512Mi", "1Gi"). Leave empty for no limit.
+shmSizeLimit: "512Mi"
+
 # imagePullSecrets for private registries
 imagePullSecrets: []