Chrome was randomly crashing while running Portal ETE
test suites.  This appears to be caused by /dev/shm being
too small in the container.  This patch increases the
size of /dev/shm in the robot container.
Change-Id: I79b6c3b05cc817b59db68327978800d7f80bd3f9
Issue-ID: INT-586
Signed-off-by: Gary Wu <gary.i.wu@huawei.com>
           initialDelaySeconds: {{ .Values.readiness.initialDelaySeconds }}
           periodSeconds: {{ .Values.readiness.periodSeconds }}
         volumeMounts:
+        - name: dshm
+          mountPath: /dev/shm
         - name: localtime
           mountPath: /etc/localtime
           readOnly: true
     {{- else }}
         emptyDir: {}
     {{- end }}
+      - name: dshm
+        emptyDir:
+          medium: Memory
       - name: localtime
         hostPath:
           path: /etc/localtime