Add floppy_content similar to cd_content

[sestegra]

Description

Add floppy_content to enable templating on mounted files.

Use Case(s)

I'm working from a builder machine that needs to pass HTTP proxy to connect on vSphere.
So, the local HTTP server can't be used to serve kickstart, seedfile, data source configuration..
Usually, I'm using cd_content to pass these files for building images.

However, for legacy Linux distributions that doesn't support to fetch file from an additional CD-ROM , I need to have the same flexibilty as cd_content to use templatefile function but for floppy.

Potential configuration

floppy_content = {
  "/ks.cfg" = templatefile("${path.cwd}/data/ks.pkrtpl.hcl", { build_username = var.build_username, build_password_encrypted = var.build_password_encrypted, vm_guest_os_language = var.vm_guest_os_language, vm_guest_os_keyboard = var.vm_guest_os_keyboard, vm_guest_os_timezone = var.vm_guest_os_timezone })
}

Potential References

• Ubuntu 18.04 doesn't support an additional CD-ROM to fetch kickstart file from.