As per the docs the following should override the image defined health check. But it fails to override the image defined health check. This is important where the image defined health check is not applicable. One such example is using the creating a MySQL cluster in that the default health check is against mysqld which is not appropriate because either ndbd or ndb_mgmd is appropriate.

This leaves the container marked as unhealthy.

Using;

healthcheck:
  test: ["NONE"]

If you use the above to launch MySQL the default health check is used, inspect output following.

            "Healthcheck": {
                "Test": [
                    "CMD-SHELL",
                    "/healthcheck.sh"
                ]
            },

Resulting in;

21b30279e77d        mysql/mysql-cluster:8.0.18                          "/entrypoint.sh mysq…"   3 minutes ago       Up 2 minutes (healthy)     1186/tcp, 2202/tcp, 3306/tcp, 33060/tcp                                  dev-mysql
0fb50981bba5        mysql/mysql-cluster:8.0.18                          "/entrypoint.sh ndbd"    3 minutes ago       Up 3 minutes (unhealthy)   1186/tcp, 2202/tcp, 3306/tcp, 33060/tcp                                  dev-mysql-ndbd-2
8746135e3f8e        mysql/mysql-cluster:8.0.18                          "/entrypoint.sh ndbd"    3 minutes ago       Up 3 minutes (unhealthy)   1186/tcp, 2202/tcp, 3306/tcp, 33060/tcp                                  dev-mysql-ndbd-1
420fb8249df8        mysql/mysql-cluster:8.0.18                          "/entrypoint.sh ndb_…"   3 minutes ago       Up 3 minutes (healthy)     1186/tcp, 2202/tcp, 3306/tcp, 33060/tcp                                  dev-mysql-mgmd

The work around is to call a stub shell which simply calls exit 0.

    healthcheck:
      test: ["CMD-SHELL", "{{ mysql_config_directory }}/healthcheck.sh"]

Resulting in;

            "Healthcheck": {
                "Test": [
                    "CMD-SHELL",
                    "/etc/cell/dev/mysql/healthcheck.sh"
                ]
            },
 And;

aaf28f87abf0        mysql/mysql-cluster:8.0.18                          "/entrypoint.sh mysq…"   3 minutes ago       Up 3 minutes (healthy)   1186/tcp, 2202/tcp, 3306/tcp, 33060/tcp                                  dev-mysql
2df7948c37fc        mysql/mysql-cluster:8.0.18                          "/entrypoint.sh ndbd"    3 minutes ago       Up 3 minutes (healthy)   1186/tcp, 2202/tcp, 3306/tcp, 33060/tcp                                  dev-mysql-ndbd-2
1a3cd97cfc80        mysql/mysql-cluster:8.0.18                          "/entrypoint.sh ndbd"    3 minutes ago       Up 3 minutes (healthy)   1186/tcp, 2202/tcp, 3306/tcp, 33060/tcp                                  dev-mysql-ndbd-1
5fea532ef20f        mysql/mysql-cluster:8.0.18                          "/entrypoint.sh ndb_…"   3 minutes ago       Up 3 minutes (healthy)   1186/tcp, 2202/tcp, 3306/tcp, 33060/tcp                                  dev-mysql-mgmd

any other mappings.
      - If I(networks) parameter is provided, will inspect each network to see if there exists
        a bridge network with optional parameter C(com.docker.network.bridge.host_binding_ipv4).
        If such a network is found, then published ports where no host IP address is specified
        will be bound to the host IP pointed to by C(com.docker.network.bridge.host_binding_ipv4).
        Note that the first bridge network with a C(com.docker.network.bridge.host_binding_ipv4)
        value encountered in the list of I(networks) is the one that will be used.
    type: list
    elements: str
    aliases:
      - ports
  pull:
    description:
       - If true, always pull the latest version of an image. Otherwise, will only pull an image
         when missing.
       - "*Note:* images are only pulled when specified by name. If the image is specified
         as a image ID (hash), it cannot be pulled."
    type: bool
    default: no
  purge_networks:
    description:
       - Remove the container from ALL networks not included in I(networks) parameter.
       - Any default networks such as C(bridge), if not found in I(networks), will be removed as well.
    type: bool
    default: no
    version_added: "2.2"
  read_only:
    description:
      - Mount the container's root file system as read-only.
      - If I(container_default_behavior) is set to C(compatiblity) (the default value), this