IPv6 healthcheck.sh failing fix

When I enabled IPv6 I later realized that the healthcheck of the container was failing.

Setting "ROCKET_ADDRESS=::" in docker-compose gives the error:
"$ docker-compose up -d --build
services.vaultwarden.environment.13 must be a string"

So to be able to use IPv6 ROCKET_ADDRESS needs to be set to ::0:
"ROCKET_ADDRESS=::0"

In bash :: doesn't equal ::0 and hence my healthcheck is failing, since it isn't rewritten to localhost

docker/healthcheck.sh

@@ -46,7 +46,7 @@ if [ -r "${CONFIG_FILE}" ]; then
 fi
 
 addr="${ROCKET_ADDRESS}"
-if [ -z "${addr}" ] || [ "${addr}" = '0.0.0.0' ] || [ "${addr}" = '::' ]; then
+if [ -z "${addr}" ] || [ "${addr}" = '0.0.0.0' ] || [ "${addr}" = '::0' ]; then
     addr='localhost'
 fi
 base_path="$(get_base_path "${DOMAIN}")"