Escape special chars before using auth in sed replace clause (#12992)

Signed-off-by: Yann Weyer <ykweyer@users.noreply.github.com>

stable/redis-ha/Chart.yaml

@@ -5,7 +5,7 @@ keywords:
 - redis
 - keyvalue
 - database
-version: 3.3.4
+version: 3.3.5
 appVersion: 5.0.3
 description: Highly available Kubernetes implementation of Redis
 icon: https://upload.wikimedia.org/wikipedia/en/thumb/6/6b/Redis_Logo.svg/1200px-Redis_Logo.svg.png

stable/redis-ha/templates/redis-ha-configmap.yaml

@@ -130,7 +130,8 @@ data:
 
     if [ "${AUTH:-}" ]; then
         echo "Setting auth values"
-        sed -i "s/replace-default-auth/$AUTH/" "$REDIS_CONF" "$SENTINEL_CONF"
+        ESCAPED_AUTH=$(echo "$AUTH" | sed -e 's/[\/&]/\\&/g');
+        sed -i "s/replace-default-auth/${ESCAPED_AUTH}/" "$REDIS_CONF" "$SENTINEL_CONF"
     fi
 
     echo "Ready..."