Add dockerdiscovery external plugin

content/explugins/dockerdiscovery.md

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++++
+title = "dockerdiscovery"
+description = "*dockerdiscovery* - add/remove DNS records for Docker containers."
+weight = 50
+tags = [  "plugin" , "docker", "discovery", "containers" ]
+categories = [ "plugin", "external" ]
+date = "2023-11-01T09:10:00-03:00"
+repo = "https://github.com/kevinjqiu/coredns-dockerdiscovery"
+home = "https://github.com/kevinjqiu/coredns-dockerdiscovery/blob/master/README.md"
++++
+
+## Description
+
+Docker discovery plugin for CoreDNS.
+
+## Syntax
+
+    docker [DOCKER_ENDPOINT] {
+        domain DOMAIN_NAME
+        hostname_domain HOSTNAME_DOMAIN_NAME
+        network_aliases DOCKER_NETWORK
+        label LABEL
+        compose_domain COMPOSE_DOMAIN_NAME
+    }
+
+* `DOCKER_ENDPOINT`: the path to the docker socket. If unspecified, defaults to `unix:///var/run/docker.sock`. It can also be TCP socket, such as `tcp://127.0.0.1:999`.
+* `DOMAIN_NAME`: the name of the domain for [container name](https://docs.docker.com/engine/reference/run/#name---name), e.g. when `DOMAIN_NAME` is `docker.loc`, your container with `my-nginx` (as subdomain) [name](https://docs.docker.com/engine/reference/run/#name---name) will be assigned the domain name: `my-nginx.docker.loc`
+* `HOSTNAME_DOMAIN_NAME`: the name of the domain for [hostname](https://docs.docker.com/config/containers/container-networking/#ip-address-and-hostname). Work same as `DOMAIN_NAME` for hostname.
+* `COMPOSE_DOMAIN_NAME`: the name of the domain when it is determined the
+    container is managed by docker-compose.  e.g. for a compose project of
+    "internal" and service of "nginx", if `COMPOSE_DOMAIN_NAME` is
+    `compose.loc` the fqdn will be `nginx.internal.compose.loc`
+* `DOCKER_NETWORK`: the name of the docker network. Resolve directly by [network aliases](https://docs.docker.com/v17.09/engine/userguide/networking/configure-dns) (like internal docker dns resolve host by aliases whole network)
+* `LABEL`: container label of resolving host (by default enable and equals ```coredns.dockerdiscovery.host```)
+
+## Examples
+
+~~~ corefile
+. {
+    docker unix:///var/run/docker.sock {
+        domain {$COREDNS_DOCKER_DOMAIN}
+        hostname_domain {$COREDNS_DOCKER_HOSTNAME_DOMAIN}
+        compose_domain {$COREDNS_DOCKER_COMPOSE_DOMAIN}
+
+        domain docker
+        hostname_domain docker
+        compose_domain docker
+
+        domain local
+        hostname_domain local
+        compose_domain local
+
+        ttl 30
+
+        network_aliases net1
+        network_aliases net2
+    }
+}
+~~~