windocker: Capture setup steps for the host machine in an ansible playbook

[sxa]

Steps are covered in #3286 (comment)

Possible needs to include the setup of C:\jw and the .gitconfig file too subject to the resolution of other issues relating to path length and permissions.

c:\workspace\.gitconfig:

[safe]
        directory = /cygdrive/c/workspace/openjdk-build

startjenkins.cmd needs:

PATH C:\Program Files\Git\usr\bin;%PATH%;c:\cygwin64\bin
set HOME=c:\workspace
java -jar agent.jar ...

[sxa]

Noting that C:\jw is now C:\workspace for consistency with the existing pipelines. Also based on the investigations for #3723 there will need to be an openjdk-build directory under workspace which is owned by the container user (Unclear whether this could cause a problem when the container, and therefore user, is rebuilt, but that seems quite likely...)