add redis healthcheck

compose.yml

@@ -120,6 +120,9 @@ services:
       - source: redis_entrypoint
         target: /custom-entrypoint.sh
         mode: 0555
+      - source: redis_healthcheck
+        target: /healthcheck.sh
+        mode: 0555
     entrypoint: /custom-entrypoint.sh
     secrets:
       - redis_password
@@ -131,6 +134,11 @@ services:
         exec redis-server /etc/redis.conf
     volumes:
       - "redis:/data:rw"
+    healthcheck:
+      test: [ "CMD-SHELL", "/healthcheck.sh" ]
+      interval: 10s
+      timeout: 5s
+      retries: 3
     networks:
       - internal
 
@@ -172,10 +180,13 @@ configs:
     template_driver: golang
   rabbitmq_healthcheck:
     name: ${STACK_NAME}_rabbitmq_healthcheck_${RABBIT_HEALTHCHECK_VERSION}
-    file: rabbitmq_healthcheck.sh
+    file: healthcheck.rabbitmq.sh
   rabbitmq_entrypoint:
     name: ${STACK_NAME}_rabbitmq_entrypoint_${RABBIT_ENTRYPOINT_VERSION}
     file: entrypoint.rabbitmq.sh.tmpl
+  redis_healthcheck:
+    name: ${STACK_NAME}_redis_healthcheck_${REDIS_HEALTHCHECK_VERSION}
+    file: healthcheck.redis.sh
 
 volumes:
   zulip:

healthcheck.redis.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -eo pipefail
+
+host="$(hostname -i || echo '127.0.0.1')"
+
+if ping="$(redis-cli -h "$host" ping)" && [ "$ping" = 'PONG' ]; then
+	exit 0
+fi
+
+exit 1