Support Docker service creation using templates for hostname, env, mount

[jnehlmeier]

Is your feature request related to a problem? Please describe.
Using templates for hostname, env, mount is generally helpful if you need unique but still meaningful hostnames, env, mounts.

E.g. when using monitoring tools to monitor all containers running in a swarm cluster it is usually desired to set the container's hostname to something meaningful, e.g. {{.Node.Hostname}}-{{.Service.Name}}-{{.Node.ID}}

Or if you want to create non-local volumes as described here moby/moby#32561 using templates is helpful.

Describe the solution you'd like
Provide UI for feature described in:

https://docs.docker.com/engine/reference/commandline/service_create/#create-services-using-templates

Describe alternatives you've considered
Creating service using Docker CLI on console.

[kasamachenkaow]

Any updates on this one, I'm looking the exactly feature.

[deviantony]

@kasamachenkaow no ETA on this, any contribution is welcome.