redis-ha Replace invocations of hostname and pidof so Redis minimal images can be used easily (#386)

* Update _configs.tpl

* Update values.yaml

* Update Chart.yaml

* Update values.yaml

* Bump Redis HA chart version to 4.35.9

---------

Co-authored-by: Aaron Layfield <Aaron.Layfield@gmail.com>

Author: partytax

charts/redis-ha/Chart.yaml

@@ -5,7 +5,7 @@ keywords:
 - redis
 - keyvalue
 - database
-version: 4.35.8
+version: 4.35.9
 appVersion: 8.2.2
 description: This Helm chart provides a highly available Redis implementation with a master/slave configuration and uses Sentinel sidecars for failover management
 icon: https://img.icons8.com/external-tal-revivo-shadow-tal-revivo/24/external-redis-an-in-memory-data-structure-project-implementing-a-distributed-logo-shadow-tal-revivo.png

charts/redis-ha/templates/_configs.tpl

@@ -327,7 +327,7 @@
 {{- end }}
 
 {{- define "vars.sh" }}
-    HOSTNAME="$(hostname)"
+    HOSTNAME="$(cat /proc/sys/kernel/hostname)"
     {{- if .Values.ro_replicas }}
     RO_REPLICAS="{{ .Values.ro_replicas }}"
     {{- end }}

charts/redis-ha/values.yaml

@@ -1104,5 +1104,6 @@ splitBrainDetection:
     failureThreshold: 5
     exec:
       command:
-        - pidof
         - sh
+        - -c
+        - test -d /proc/1