add '=' operand support

[zam5607822]

when i write these in template file: $is_https = "true"

docker-gen complained:

Unable to parse template: template: nginx.tmpl:188: unexpected "=" in operand

it seems that template engine does not support '=' operand,but text/template in go package does support,see Package template which says:

Variables previously declared can also be assigned, using the syntax: $variable = pipeline

so what's the problem? is the version of template which docker-gen used too old?

[vsalvino]

I had the same issue. Discovered that feature was added in go 1.11. The docker-gen releases are all built with go 1.9.

I created a fork and got it working with go 1.11 https://github.com/coderedcorp/docker-gen

Also available on docker hub https://hub.docker.com/r/coderedcorp/docker-gen

[blazej-pachut-gforces]

👍 I've faced same issue while trying to elegantly fix https://github.com/jwilder/nginx-proxy/issues/1132 😞

[tjhiggins]

+1

[buchdag]

Non longer relevant, docker-gen is built with up-to-date version of Go.