US-620855 Add detemplatize executable using multi stage docker build

[akshithac-21]

Using detemplatize image as multi stage docker build, to avoid writing custom code to copy detemplatize library for building images with different OS and JDK.

[Saurabh-16]

@akshithac-21 With this change, we should be good to update this readme https://github.com/pegasystems/docker-pega-web-ready/blob/master/docs/Building-Image-With-Own-OS-And-JDK.md to remove the instructions to copy the detemplatize executable.

[kingakowalska1]

Hi,

I think we can safely combine lines 11 and 13 and shorten the first step to:

1. Create a Dockerfile for your custom pega-web-ready image using your base image and the open-source pega-web-ready Dockerfile code.

The rest looks great!

Thanks,
Kinga

[kingakowalska1]

Looks great!